1.1 Purpose

This document provides users of the MESSENGER XRS data products with a detailed description of the XRS instrument, data product generation, validation, and storage. The data products are the calibrated data products produced from each of the EDR data products and the reduced data products produced from the calibrated data products. The primary XRS data product consists of an X-ray spectrometer measurement over a given area of the Mercury surface.

1.2 Scope

The goal of this document is to provide thorough and complete information, so that PDS users can read and understand the data product long after the completion of the MESSENGER mission. As such, this document provides a common reference for scientists, data analysts, software engineers, and researchers to access and understand the MESSENGER X-Ray Spectrometer PDS archived data. The primary XRS data product consists of three 244 channel X-ray spectra collected over a given area of the Mercury surface. The XRS determines the surface elemental composition by analyzing the most prominent fluorescent lines in the 1-10 keV energy range: Mg, Al, Si, S, Ca, Ti, and Fe.

This document addresses the calibrated data records (Level-3) and reduced data records (Level-5). Note that the data product levels stated in this document correspond to the data levels outlined by the National Research Council Committee on Data Management and Computation (CODMAC). These data levels are described more fully in Section 7.2 APPENDIX: CODMAC/NASA Definition of Processing Levels on page 33.

2 Applicable Documents

The Messenger XRS CDR/RDR SIS is responsive to the following documents:

· Planetary Data System Standards Reference, March 20, 2006, Version 3.7. JPL D-7669, Part-2.

· MESSENGER EDR Software Interface Specification for the X-RAY Spectrometer.

· MESSENGER Data Management and Archiving Plan. The Johns Hopkins University, APL.

· MESSENGER Project Archive Generation, Validation, and Distribution Plan.

· MESSENGER Mercury: Surface, Space Environment, Geochemistry, Ranging; A mission to Orbit and Explore the Planet Mercury, Concept Study, March 1999.

· [PLR] Appendix 7 to the discovery program Plan; Program Level Requirement for the MESSENGER Discovery project, June 20, 2001.

· MESSENGER Gamma Ray Spectrometer (GRS) EDR-to-CDR-to-RDR Processing.

3 Relationships with Other Interfaces

The XRS CDR data products are dependent on the XRS EDR data products. Changes to the EDR products have required revisions to the associated CDR products. The XRS CDR data products are also dependent on valid SPICE Kernel generation for timing and spatial information. Changes or revisions to the SPICE Kernel have also required revisions to the XRS CDR products. Changes to data processing programs (see Section 4.3, Data Processing on page 11) that convert EDR data to CDR data have also resulted in revised CDR data products.

The XRS RDR data products are dependent on the XRS CDR data products and on valid SPICE kernels for timing and spatial information. Changes to the XRS CDR data products or the SPICE kernels have resulted in revisions to the RDR products.

4 Data Product Characteristics and Environment

4.1 Instrument Overview

The Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) mission was designed to orbit Mercury following one Earth flyby, two flybys of Venus and three of Mercury. It launched in August 2004 and used the flybys of Earth, Venus and Mercury to achieve an orbit insertion around Mercury in March 2011. Initial data collection began during the three flybys of Mercury and primarily consisted of global mapping and measurements of the surface, atmosphere, and magnetosphere composition. MESSENGER remained in orbit for the rest of the nominal mission which ended in March 2012 [see MESSENGER Data Management and Archiving Plan for extended mission updates]. Once in orbit around Mercury, it began a series of observations using multiple instruments. These observations provided data to answer questions about the nature and composition of Mercury’s crust, tectonic history, structure of the atmosphere/magnetosphere, and the nature of the polar caps.

The XRS instrument on board the MESSENGER spacecraft was designed to answer questions such as:

What planetary formational processes led to the high metal/silicate ratio in Mercury?
What is the geological history of Mercury?

Answers to these questions will provide insight into the formation of planets from primitive solar nebula and contribute to our understanding of how terrestrial planets form and evolve. XRS collected information via X-Ray spectroscopy by analyzing the most prominent fluorescent lines in the 1-10 keV energy range, i.e. Mg, Al, Si, S, Ca, Ti, and Fe. X-rays emitted from the solar corona provide the excitation source for the detected X-rays from the planetary surface (to a depth of <100 mm). Thus quantification of elemental abundances from the observed XRS spectra also requires knowledge of the solar X-ray spectrum at the same time. In order to understand the structure and nomenclature of the XRS data products it is useful to understand how the XRS instrument operates. The XRS instrument consists of three gas proportional counter (GPC) planetary X-ray detectors. The GPCs detect individual photons. An incoming X-ray photon penetrates the thin beryllium window of a sealed gas-filled chamber and interacts with the gas, producing an energetic photoelectron (known as the photoelectric effect). The kinetic energy of the electron is then progressively absorbed in the gas, leaving an ionization trail. The free electrons from the ionization are attracted to a thin wire anode at high potential stretched down the center of the chamber. In the region of high electric field strength, very close to the wire, the electrons reach sufficient energy to liberate even more electrons in a stable multiplication effect that provides signal gain. This signal gain helps to overcome the preamplifier noise. Because the energy resolution of GPCs is not adequate to separate the lower energy x-ray lines from Mg, Al, and Si, the balanced filter technique is used: one GPC has a thin aluminum filter, one a thin magnesium filter, and the third GPC has no filter.

To record solar X-ray spectra simultaneously with planetary observations, the XRS sensor consists of a passively cooled silicon Solar Monitor Detector with a beryllium filter. The entire sensor is stored in two physical units, the Solar Assembly for X-rays (SAX) and the Mercury X-ray Unit (MXU). A third unit, the Main Electronics for X-rays (MEX) unit, contains analog and digital electronics.

The SAX is located at the “top center” edge of the solar shield (see Figure 1) and contains the Solar Monitor Detector, Preamp and Shaping electronics, as well as the radiator and heater for thermal control. The MXU and MEX are co-located within the payload adapter ring.

Figure 1 XRS Configuration on MESSENGER

The XRS sensor recorded 40 second integration periods at periherm and 450 second integration periods at apoherm. The data consists of three 244-element X-ray energy histograms, one for each GPC and one 231-element X-ray energy histogram for the SAX. The EPU software incremented one of the 244 software accumulators for each valid x-ray event. The accumulator was chosen based on the energy measurement provided by the sensor hardware.

The instrument paper can be found as follows:

“The X-Ray Spectrometer on the MESSENGER Spacecraft”

Charles E. Schlemm II, Richard D. Starr, George C. Ho, Kathryn E. Bechtold, Sarah A. Hamilton, John D. Boldt, William V. Boynton, Walter Bradley, Martin E. Fraeman, Robert E. Gold, John O. Goldsten, John R. Hayes, Stephen E. Jaskulek, Egidio Rossano, Robert A. Rumpf, Edward D. Schaefer, Kim Strohbehn, Richard G. Shelton, Raymond E. Thompson, Jacob I. Trombka, and Bruce D. Williams

Space Sci Rev DOI 10.1007/s11214-007-9248-5 (2007).

4.2 Data Product Overview

The XRS CDR is a single data product that contains the following spectra, each uniquely identified at the time of the collection interval:

Monitor Spectrum – A single energy calibrated solar monitor x-ray spectrum (channels 23 to 253) for each XRS collection interval.

GCP1-Mg Spectrum – A single energy calibrated GCP1-Mg x-ray spectrum (channels 10-253) for each XRS collection interval.

GPC2-Al Spectrum - A single energy calibrated GCP2-Al x-ray spectrum (channels 10-253) for each XRS collection interval.

GPC3-Un Spectrum - A single energy calibrated GCP3-UN x-ray spectrum (channels 10-253) for each XRS collection interval.

Event counts per channel are converted to flux as a function of energy.

The energy calibration is:

GPC1: 0.0383*channel + 0.383

GPC2: 0.0383*channel + 0.383

GPC3: 0.0379*channel + 0.379

SolMon: 0.0375*channel + 0.863

Engineering and housekeeping data are also part of each CDR.

The engineering data stored in the data files have been smoothed (See the MESSENGER XRS_EDR2CDR2RDR calibration document for details on the smoothing algorithm).

Each MESSENGER X-Ray Spectrometer CDR product consists of two files. One file contains the data itself and is arranged in binary table format. The other file is a label file that describes the content of the data file. The label file defines the start time and end time of the observation, product creation time, etc. It does NOT describe the structure of the binary file itself. Instead, the PDS label file contains a reference pointer to a separate format file. The format file describes the structure of the binary table and each of the different fields within the table. This format file resides in the label directory of the archive volume, because it applies to the structure of all the binary table files.

The RDR Footprint product consists of a data file and label for each CDR observation whose FOV_STATUS is 1 or 3; that is, each CDR observation whose footprint is on the planet (1) or partially on the planet (3) and the on-planet portion of the footprint is at least partially lit by the sun. Each RDR footprint consists of a set of points in latitude and longitude that correspond to the perimeter of the field of view of the instrument during the integration time of the CDR observation. The data file for the footprints is a comma-separated value file with each point in the perimeter on its own line, latitude followed by east longitude, both in decimal degrees.

The RDR Map product consists of a set of maps that show the variation in the ratios of detected elements over the surface of the planet for which CDR data is available: Mg/Si, Al/Si, S/Si, Ca/Si, and Fe/Si. A second set of maps shows the uncertainty in the measurements presented in the ratio maps. A third set of maps shows the effective resolution of the map; that is, the weighted average footprint of samples used to create the ratio maps in kilometers. Each of the five elemental maps, the five uncertainty maps, and the five effective resolution maps consists of two files: a JPEG2000 image using the lossless compression mode, and a label file. The relationship between the image and label is the same as the relationship between the CDR data file and the label. Both the ratio map and uncertainty map are dimensionless; the unit of the effective resolution map is kilometers.

The maps are 1440 x 720 pixels corresponding to 1/4-degree pixels in a equirectangular cylindrical projection with parallel equator, centered on {lat,lon}={0,0} (See SNYDER1987, Map Projections – A Working Manual, Snyder, 1987, page 90). Thus, the first column represents longitude = -180 to -179.75 degrees, the bottom row is -90 to -89.75 degrees south latitude, etc. All images are 8-bit grayscale.

The ratio, error, and effective resolution maps are linearly scaled such that the maximum pixel value, 255, represents the maximum data value for the map, specified in the concomitant label. A value of zero in any of the map types indicates no data. To derive the actual value of the map at a given position, one multiplies the pixel value by the maximum data value divided by the maximum pixel value. For example, if the maximum pixel value corresponds to a Mg/Si ratio of 1.0 in the appropriate ratio map, one would find the value of the ratio at a particular location by multiplying the pixel value at that location by the factor 1.0/255 = 0.00392.

The Mg/Si and Al/Si maps include data acquired both during solar flares and more quiescent 'quiet Sun' conditions. The dynamic range of Al/Si on Mercury is considerably smaller than that of Mg/Si and the errors on individual quiet sun Al/Si analyses are relatively large. The other three ratio maps all require flare data and as a result the spatial coverage is more spotty. To improve statistical precision, quiet-Sun data (Mg/Si and Al/Si maps) were spatially binned such that XRS count rates acquired within a given spatial bin were co-added prior to derivation of elemental ratios. Bin sizes were selected based on spatial resolution of individual measurements. Measurements with footprint sizes (equivalent diameters of a circular footprint with equivalent area to the actual measurement area) larger than 100 km were divided into bins of roughly 66×66 km; those with footprints from 50-100 km were divided into roughly 26×26 km bins and measurements with footprints smaller than 50 km were not binned.

The RDR maps are composed of a subset of CDR records spanning the Mercury Orbit, Mercury Orbit Year 2, Mercury Orbit Year 3, Mercury Orbit Year 4, and Mercury Orbit Year 5 mission phases. The criteria for inclusion in the map are the following: the FOV status of the record is 1 or 3; the signal-to-noise ratio of the GPC spectra was sufficient for elemental analysis; the SAX detector was on and provided a solar spectrum; contamination from charged particle interactions was below a threshold; and, the footprint of the sample given the position and pointing of the instrument was sufficiently small.

Map pixels represent a weighted average of the samples whose footprints overlap the pixel location; the weighted average favors measurements with smaller errors and smaller footprints. Because the mapping procedure introduces artifacts due to the sharp edges of individual measurement footprints, the maps are subjected to a final smoothing with a location-dependent smoothing algorithm, based on the spatial resolution (average footprint size of overlapping measurements) in a given pixel.

Please see the following paper for further details on RDR map generation:

Weider, S.Z., Nittler, L.R., Starr, R.D., Crapster-Pregont, E.J., Peplowski, P.N., Denevi, B.W., Head, J.W., Byrne, P.K., Hauck, S.A. II., Ebel, D.S. and Solomon, S.C. (2015) Evidence for geochemical terranes on Mercury: Global mapping of major elements with MESSENGER’s X-Ray Spectrometer. Earth Planet. Sci. Lett. 416, 109-120.

4.3 Data Processing

4.3.1 Data Processing Level

The Committee on Data Management and Computation (CODMAC) data level numbering system is used to describe the processing level of the XRS data products. XRS CDR products are considered a CODMAC “Level 3” (Calibrated) or NASA “Level 1A.”

The RDRs are CODMAC “Level 5” data products. See the “CODMAC/NASA Definition of Processing Levels for Science Data Sets” in section 7.2.

4.3.2 Data Product Generation

The X-Ray Spectrometer CDR files were produced by the University of Arizona and provided to MESSENGER Science Operations Center (SOC) operated jointly by APL and ACT. The University of Arizona was responsible for converting the data to the proper PDS labeled format. The CDR data products were made available to the MESSENGER Science Team for initial evaluation and validation. At the end of the evaluation and validation period, the data were organized and made available to the PDS for distribution to the science community. These products are used for engineering support, direct science analysis, and construction of other science products.

The XRS RDR Footprint files were produced at the University of Arizona using the integration start and stop times and midpoint altitudes from the corresponding CDR records, and the final SPICE kernels for the instrument and spacecraft. For each observation, a HEALPix map was created at a resolution dependent on the midpoint altitude. HEALPix creates a map on a sphere with equal area, curvilinear quadrilateral pixels centered on equally spaced latitude bands. The base map has twelve pixels that are subdivided based on the NSIDE parameter, which determines the number of subpixels placed along the side of each base map pixel; each pixel is, thus, divided into NSIDE by NSIDE subpixels. At altitudes at or below 10 km, NSIDE is set to 4096. At altitudes greater than 10 but less than and including 60 km, NSIDE is 1024. At altitudes above 60 km, NSIDE is 256. These values were determined experimentally and were modified until the consensus of the team was that the footprints produced reasonably represented the true footprint of the observations. Because the footprint perimeters are vertices of the HEALPix map at the selected resolution, the resolution of the map necessarily adds some uncertainty to the map boundaries.

For each CDR observation, the midpoint altitude and the instrument field of view are used to mark pixels on the HEALPix map that fall within the observation’s footprint. After all constituent pixels are marked, a perimeter is derived whose vertices are the exterior vertices of the boundary pixels. This perimeter is stored as latitude and east longitude pairs in decimal degrees. Pole-spanning footprints may contain a small number of anomalous vertices in the interior of the footprint shape; these are an artifact of the HEALPix processing and may be ignored.

There are two suggested methods for correlating footprints to their CDR record counterparts. When processing the dataset in bulk, the spacecraft clock can be used a primary key for associating footprints and CDR records. When processing much smaller sets, the UTC date can be used as a first key to constrain the search. CDR records are organized into folders based on UTC year, month, and day. Within a single UTC day, all CDR records are collected into a single file with each observation a row in that file. Footprints are organized into folders based on UTC year, month, day, and hour. Within a single UTC hour, footprints are stored as individual files. To verify the correspondence of a footprint and CDR record, the spacecraft clock should be used.

For further details on the HEALPix library and algorithm, please see K. M. Gorski, E. Hivon, A. J. Banday, B. D. Wandelt, F. K. Hansen, M. Reinecke, M. Bartelman, HEALPix: A Framework for High-Resolution Discretization and Fast Analysis of Data Distributed on the Sphere, Astrophysics, 622, 759-771, 10.1086/427976, 2004.

The XRS RDR Map files were produced by the Carnegie Institute of Washington and provided to the MESSENGER Science Operations Center (SOC) operated jointly by APL and ACT. The University of Arizona was responsible for converting the data to the proper PDS labeled format. The RDR Map data products were made available to the MESSENGER Science Team for initial evaluation and validation. At the end of the evaluation and validation period, the data were organized and made available to the PDS for distribution to the science community. These products are used for engineering support, direct science analysis, and construction of other science products.

4.3.3 Data Flow

The MESSENGER Team plans data acquisition and generates and validates data archives under the auspices of the MESSENGER Project Scientist. The SOC supports and works with the MOC, The Science Team, instrument scientists, and the PDS.

A primary data server residing at the Johns Hopkins University/Applied Physics Lab (JHU/APL) served as the data storage facility for all MESSENGER instruments. Inputs to the SOC consisted of telemetry in the form of CCSDS packets.

Figure 2 MESSENGER data flow

4.3.4 Labeling and Identification

There is a corresponding PDS label file for each X-Ray data file. See Section 5, Detailed Data Product Specifications, for sample PDS label files and a complete description of the label format.

4.4 Standards Used in Generating Data Products

4.4.1 PDS Standards

The XRS CDR and RDR data products comply with the PDS standards for file formats and labels as specified in the PDS Standards Reference.

The CDR data product includes:

· A binary table file (the primary data).

· A label file (includes a high-level description of the parameters corresponding to the binary table).

· A pointer to a FORMAT file describing the structure of the binary table file.

The RDR Footprint data product includes:

A comma-separated value spreadsheet; each line represents a vertex in the footprint perimeter, and the values are recorded latitude and longitude in decimal degrees.
A label file that describes the observation from which the footprint is derived.

The RDR Map data product includes:

· A JPEG 2000 file (the primary data).

· A label file (includes a high-level description of the parameters corresponding to the JP2 image file).

4.4.2 Coordinate Systems

There are two coordinate systems in use:

· The celestial reference system used for target and spacecraft position and velocity vectors and camera pointing.

· The planetary coordinate system for geometry vectors and target location. The celestial coordinate system is J2000 (Mean of Earth equator and equinox of J2000). The planetary coordinate system is planetocentric.

The list below describes the computational assumptions for the geometric and viewing data provided in the PDS label:

· The mid-point time of observation is used for the geometric element computations. (The mid-point is calculated using the Start and End times from the EDR set.)

· Label parameters reflect observed, not true, geometry. Therefore, light-time and stellar aberration corrections are used as appropriate.

· The inertial reference frame is J2000 (also called EME2000).

· Latitudes and longitudes are planetocentric.

· The "sub-point" of a body on a target is defined by the surface intercept of the body-to-target-center vector. This is not the closest point on the body to the observer.

· Distances are in km, speeds in km/sec, angles, in degrees, angular rates in degrees/sec, unless otherwise noted.

· Angle ranges are 0 to 360 degrees for azimuths and local hour angle. Longitudes range from 0 to 360 degrees (positive to the East). Latitudes range from -90 to 90 degrees.

· Solid angles units are in steradians.

· SPICE kernel files are used in the geometric parameters (See APPENDIX: SPICE Kernel Files Used in MESSENGER Data Products on page 33.)

4.4.3 Data Storage Conventions

The data are organized following PDS standards. The MESSENGER SOC transfers data to PDS via electronic transfer and delivery. After verification of the data transfer PDS provides public access to MESSENGER science data products through its online data distribution system.

4.5 Data Validation

The XRS CDR and RDR data products were validated by the XRS Instrument Scientist for science content and for compliance with PDS archive standards [MESSENGER Data Management and Archiving Plan].

5 Detailed Data Product Specifications

5.1 Data Product Structure and Organization

Timed series spectral analysis can be used to create calibrated data sets and temporally and spatially binned corrected X-ray spectra. The resulting data product is structured as a 231-column data table with data records collected over one earth day.

The XRS CDR data products are organized as binary data files containing the data values with a detached ASCII text PDS label file for each binary file.

The XRS RDR Footprint data products are organized in a tree similarly to the CDR data. They are grouped in subdirectories by UTC year, month, day, and hour, e.g. a footprint corresponding to a CDR observation whose start time was 2013-01-02-03:04:05 would be stored in subdirectory 2013/01/02/03. Each footprint corresponding to a CDR is stored in its own data file named XRS_FP_<P>_<MET>.CSV, where <P> is the spacecraft clock partition (either 1 or 2), and <MET> is the mission elapsed time in seconds within that clock partition. Each footprint has an accompanying label file that describes the footprint and the CDR record from which it was derived.

The XRS RDR Map data products are organized as five elemental maps, five uncertainty maps, and five effective resolution maps consisting of two files each: a JPEG2000 image using the lossless compression mode, and a label file.

See Section 5.2 Data Format Description on page 19 for sample PDS label files and an explanation of the label format.

5.1.1 Handling Errors

Even with data validation procedures applied to the volumes, it is inevitable errors will be introduced into the archive. A plan is required to handle errors discovered in data volumes that have already been produced.

As errors were discovered, they were reported to the XRS data processing facility. Corrected CDRs and RDRs were provided as part of the normal deliveries which occurred during the scheduled delivery dates.

5.1.2 Geometric Elements

The geometric elements are an essential part of the archive. They contain the data and information to characterize the geometric properties of the sensor and to fully describe the viewing geometry of an observation. These data are essential to geodetic, cartographic, and photometric applications.

The geometric elements are organized according to the SPICE kernel concepts adopted by the Navigational & Ancillary Information Facility (NAIF) at the Jet Propulsion Laboratory. SPICE is an acronym for Spacecraft, Planet, Instrument, C-matrix, and Event kernels.

The SPICE kernel data set used in the creation of the CDR and RDR data sets is available from the NAIF ftp site. SPICE kernels evolve and improve as further analysis is done. The analysis may include correcting not-yet-discovered errors and filling in missing items. The PDS data labels attached to the CDRs and RDRs are based on the most up-to-date SPICE information available at the time of product creation.
Data Format Description

CDR data are stored in binary table format. A detached PDS label file provides a detailed description of the structure of the binary table. For the CDR product, an example label follows:

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 1

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 2755

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "XRSCDR2011030"

PRODUCT_VERSION_ID = "1.0"

PRODUCT_CREATION_TIME = 2011-08-30T21:20:02

PRODUCT_TYPE = "CDR"

STANDARD_DATA_PRODUCT_ID = "XRSCDR"

SOFTWARE_NAME = "UA_LPL_EDR2CDR"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "XRAY SPECTROMETER"

INSTRUMENT_ID = "XRS"

DATA_SET_ID = "MESS-H-XRS-3-CDR-SPECTRA-V1.0"

MISSION_PHASE_NAME = "MERCURY 3 CRUISE"

TARGET_NAME = "MERCURY"

START_TIME = 2011-08-03T05:59:16

STOP_TIME = 2011-08-03T05:59:16

SPACECRAFT_CLOCK_START_COUNT = "220838615"

SPACECRAFT_CLOCK_STOP_COUNT = "220838615"

^TABLE = "XRSCDR2011030.DAT"

OBJECT = TABLE

COLUMNS = 231

INTERCHANGE_FORMAT = BINARY

ROW_BYTES = 2755

ROWS = 1

DESCRIPTION ="

This table contains X-ray spectra and associated instrument

parameters, as observed by the MESSENGER X-Ray Spectrometer (XRS).

Detailed descriptions for the parameters defined below are contained

in the CDR SIS document. The complete column definitions are contained

in an external file found in the LABEL directory of the archive volume.

^STRUCTURE = "XRS_CDR.FMT"

END_OBJECT = TABLE

A sample label for the RDR Footprint product is as follows:

PDS_VERSION_ID = PDS3

/*** FILE FORMAT ***/

FILE_RECORDS = 840

RECORD_TYPE = STREAM

RECORD_BYTES = 29

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "XRS_FP_1_223411510_CSV"

PRODUCT_VERSION_ID = "1.0"

PRODUCT_CREATION_TIME = 2016-08-03T17:46:06

PRODUCT_TYPE = "RDR"

STANDARD_DATA_PRODUCT_ID = "XRSRDR"

SOFTWARE_NAME = "XMAP"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "XRAY SPECTROMETER"

INSTRUMENT_ID = "XRS"

DATA_SET_ID = "MESS-H-XRS-5-RDR-FOOTPRINTS-V1.0"

TARGET_NAME = "MERCURY"

START_TIME = 2011-09-02T00:40:42

STOP_TIME = 2011-09-02T00:45:42

SPACECRAFT_CLOCK_START_COUNT = "1/223411510"

SPACECRAFT_CLOCK_STOP_COUNT = "1/223411810"

^SPREADSHEET = "XRS_FP_1_223411510.CSV"

OBJECT = SPREADSHEET

ROWS = 840

ROW_BYTES = 29

FIELDS = 2

FIELD_DELIMITER = "COMMA"

OBJECT = FIELD

FIELD_NUMBER = 1

NAME = "LATITUDE"

BYTES = 13

DATA_TYPE = ASCII_REAL

UNIT = "DEGREE"

DESCRIPTION = "Latitude in Mercury-fixed coordinates of

this vertex in the footprint perimeter."

END_OBJECT = FIELD

OBJECT = FIELD

FIELD_NUMBER = 2

NAME = "LONGITUDE"

BYTES = 13

DATA_TYPE = ASCII_REAL

UNIT = "DEGREE"

DESCRIPTION = "East longitude in Mercury-fixed

coordinates of this vertex in the footprint perimeter."

END_OBJECT = FIELD

END_OBJECT = SPREADSHEET

END

A sample label for the RDR Map product is as follows:

PDS_VERSION_ID = "PDS3"

PRODUCT_ID = "XRS_MAP_MG_SI_20150424_JP2"

PRODUCT_VERSION_ID = "1.0"

PRODUCT_CREATION_TIME = 2015-11-25T16:23:01

PRODUCT_TYPE = "RDR"

STANDARD_DATA_PRODUCT_ID = "XRSRDR"

SOFTWARE_NAME = "UA_LPL_EDR2CDR"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "XRAY SPECTROMETER"

INSTRUMENT_ID = "XRS"

DATA_SET_ID = "MESS-H-XRS-3-RDR-MAPS-V1.0"

MISSION_PHASE_NAME = {"MERCURY ORBIT", "MERCURY ORBIT YEAR 2",

"MERCURY ORBIT YEAR 3",

"MERCURY ORBIT YEAR 4",

"MERCURY ORBIT YEAR 5"}

TARGET_NAME = "MERCURY"

START_TIME = 2011-04-07T03:19:53.691

STOP_TIME = 2015-04-24T21:05:34.295

SPACECRAFT_CLOCK_START_COUNT = "1/210633861"

SPACECRAFT_CLOCK_STOP_COUNT = "2/072233522"

DESCRIPTION = "Map of the ratio of Mg to Si, linearly

scaled such that the maximum pixel

value corresponds to a Mg/Si value

of 0.782055."

OBJECT = COMPRESSED_FILE

FILE_NAME = "XRS_MAP_MG_SI_20150424.JP2"

FILE_RECORDS = UNK

RECORD_TYPE = UNDEFINED

ENCODING_TYPE = JP2

ENCODING_TYPE_VERSION_NAME = "ISO/IEC15444-1:2004"

INTERCHANGE_FORMAT = BINARY

REQUIRED_STORAGE_BYTES = "14745600"

UNCOMPRESSED_FILE_NAME = "XRS_MAP_MG_SI_20150424.IMG"

^DESCRIPTION = "JP2INFO.TXT"

END_OBJECT = COMPRESSED_FILE

OBJECT = UNCOMPRESSED_FILE

RECORD_TYPE = FIXED_LENGTH

FILE_RECORDS = 1440

RECORD_BYTES = 11520

^IMAGE = "XRS_MAP_MG_SI_20150424.IMG"

OBJECT = IMAGE

NAME = "RATIO OF MG TO SI"

LINES = 1440

LINE_SAMPLES = 720

SAMPLE_TYPE = LSB_INTEGER

SAMPLE_BITS = 8

UNIT = NONE

SCALING_FACTOR = 0.0030668824

OFFSET = 0

DERIVED_MINIMUM = 0

DERIVED_MAXIMUM = 0.782055

MISSING_CONSTANT = 0

END_OBJECT = IMAGE

END_OBJECT = UNCOMPRESSED_FILE

OBJECT = IMAGE_MAP_PROJECTION

^DATA_SET_MAP_PROJECTION = "DSMAP.CAT"

MAP_PROJECTION_TYPE = "SIMPLE CYLINDRICAL"

KEYWORD_LATITUDE_TYPE = "PLANETOCENTRIC"

MAP_RESOLUTION = 4 <pix/degree>

A_AXIS_RADIUS = 2439.4 <km>

B_AXIS_RADIUS = 2439.4 <km>

C_AXIS_RADIUS = 2439.4 <km>

POSITIVE_LONGITUDE_DIRECTION = "EAST"

CENTER_LATITUDE = 0.0 <deg>

CENTER_LONGITUDE = 0.0 <deg>

LINE_FIRST_PIXEL = 1

LINE_LAST_PIXEL = 1440

SAMPLE_FIRST_PIXEL = 1

SAMPLE_LAST_PIXEL = 720

MAP_PROJECTION_ROTATION = 0.0

MAP_SCALE = 10.6 <km/pix>

MAXIMUM_LATITUDE = 90.0 <deg>

MINIMUM_LATITUDE = -90.0 <deg>

WESTERNMOST_LONGITUDE = -180.0 <deg>

EASTERNMOST_LONGITUDE = 180.0 <deg>

LINE_PROJECTION_OFFSET = 0.0 <pixel>

SAMPLE_PROJECTION_OFFSET = 0.0 <pixel>

COORDINATE_SYSTEM_TYPE = "BODY-FIXED ROTATING"

COORDINATE_SYSTEM_NAME = "PLANETOCENTRIC"

END_OBJECT = IMAGE_MAP_PROJECTION

END

Note: The external file “XRS_CDR.FMT” defines the structure of the binary table for the CDR product. No format files are provided for the RDR products.

5.3 Index Format Description

The index files are stored in ASCII table format. A detached PDS label file provides a detailed description of the structure of the ASCII table. Below is a sample index file label.

PDS_VERSION_ID = PDS3

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 235

FILE_RECORDS = 350582

^INDEX_TABLE = "INDEX.TAB"

VOLUME_ID = MESSXRS_3001

DATA_SET_ID = {"MESS-H-XRS-5-RDR-FOOTPRINTS-V1.0",

"MESS-H-XRS-3-RDR-MAPS-V1.0"}

MISSION_NAME = "MESSENGER"

INSTRUMENT_NAME = "XRAY SPECTROMETER"

PRODUCT_CREATION_TIME = 2017-02-08T14:33:23

DESCRIPTION = "This index file lists information

about each of the Messenger XRS RDR data products contained on

this archive volume."

OBJECT = INDEX_TABLE

INTERCHANGE_FORMAT = ASCII

ROW_BYTES = 235

ROWS = 350582

COLUMNS = 13

INDEX_TYPE = SINGLE

OBJECT = COLUMN

COLUMN_NUMBER = 1

NAME = VOLUME_ID

DATA_TYPE = CHARACTER

START_BYTE = 2

BYTES = 12

DESCRIPTION = "The volume on which a data product is

stored."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 2

NAME = PATH_NAME

DATA_TYPE = CHARACTER

START_BYTE = 17

BYTES = 30

DESCRIPTION = "The full directory path to the file

relative to the volume root directory."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 3

NAME = FILE_NAME

DATA_TYPE = CHARACTER

START_BYTE = 50

BYTES = 26

DESCRIPTION = "The name of the file containing a data

product's PDS label."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 4

NAME = PRODUCT_ID

DATA_TYPE = CHARACTER

START_BYTE = 79

BYTES = 26

DESCRIPTION = "Unique identifier for a XRS RDR

product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 5

NAME = PRODUCT_TYPE

DATA_TYPE = CHARACTER

START_BYTE = 108

BYTES = 3

DESCRIPTION = "Type of XRS product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 6

NAME = PRODUCT_CREATION_TIME

DATA_TYPE = TIME

START_BYTE = 113

BYTES = 19

DESCRIPTION = "UTC date and time that a product

was created, in the format

yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 7

NAME = PRODUCT_VERSION_ID

DATA_TYPE = CHARACTER

START_BYTE = 134

BYTES = 4

DESCRIPTION = "The version identifier of the product.

The first version of a product is

version 1.0. If the product is revised

and re-released, the version ID is

incremented."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 8

NAME = RELEASE_ID

DATA_TYPE = CHARACTER

START_BYTE = 141

BYTES = 4

DESCRIPTION = "The ID of the MESSENGER mission data

release. The first release is 0001,

followed by 0002, etc."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 9

NAME = TARGET_NAME

DATA_TYPE = CHARACTER

START_BYTE = 148

BYTES = 7

DESCRIPTION = "Planetary body that is the target of

observation; e.g., MERCURY."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 10

NAME = START_TIME

DATA_TYPE = TIME

START_BYTE = 157

BYTES = 23

DESCRIPTION = "UTC date and time at the beginning

of data acquisition for this product,

in the format yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 11

NAME = STOP_TIME

DATA_TYPE = TIME

START_BYTE = 181

BYTES = 23

DESCRIPTION = "UTC date and time at the end of

data acquisition for this product,

in the format yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 12

NAME = SPACECRAFT_CLOCK_START_COUNT

DATA_TYPE = CHARACTER

START_BYTE = 206

BYTES = 12

FORMAT = "A12"

DESCRIPTION = "Value of the spacecraft clock at

the beginning of data acquisition

for this product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 13

NAME = SPACECRAFT_CLOCK_STOP_COUNT

DATA_TYPE = CHARACTER

START_BYTE = 221

BYTES = 12

FORMAT = "A12"

DESCRIPTION = "Value of the spacecraft clock at

the end of data acquisition for this

product."

END_OBJECT = COLUMN

END_OBJECT = INDEX_TABLE

END

5.4 File Naming Conventions

The file names developed for PDS data volumes are restricted to a 36 character file name and a 3 character extension name with a period separating the file and extension names.

The general form of the XRS CDR file name is "XRSCDRYYYYDOY.DAT", where:

XRS Instrument identifier: represents the XRS instrument

CDR CDR data type

YYYY The four-digit year corresponding to the MET for each record in the CDR

DOY The three-digit UTC day of year corresponding to the MET for each record in the CDR

.DAT The file extension is always the three character

mnemonic ‘DAT’, indicating data stored in binary format.

The general form of the XRS RDR Footprint file name is XRS_FP_P_MET.CSV, where:

XRS Instrument identifier

FP RDR product identifier

P Spacecraft clock time partition for the CDR from which the

footprint is derived, either 1 or 2

MET Spacecraft clock time in seconds within the partition

.CSV The file extension is always the three character

mnemonic ‘CSV’, indicating data stored in comma-separated value

format

For the JPEG 2000 format RDR Map products, the general form of the name is “XRS_MXX_EL_SI_YYYYMMDD.JP2” where:

XRS Instrument identifier

MXX The type of RDR: MAP for map, UNC for uncertainty and RES for

resolution

EL Two-character element identifier: AL for aluminum,

CA for calcium, FE for iron, MG for magnesium, and S_ for

sulfur

SI SI for silicon, the element that is the consequent in the ratio

YYYY The four digit year corresponding to the last CDR sample

included in the map

MM The two-digit month (01-12) corresponding to the last CDR

sample included in the map

DD The two-digit day-of-month (01-31) corresponding to the last

CDR sample included in the map

5.5 Label and Header Description

5.5.1 PDS Label File Format

The XRS CDR and RDR data products have detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file.

Below are the keyword definitions for the detached PDS label files:

BYTES

The number of bytes allowed in each field. Applies to RDR footprints only.

COLUMNS

Identifies the number of columns in the table. Applies to CDR tables only.

DATA_SET_ID

Uniquely identifies the CDR or RDR file as part of a volume collection, organized by sensor, mission phase, and version number.

DATA_TYPE

Supplies the internal representation and/or mathematical properties of a value being stored. In this case, “ASCII_REAL”. Applies to RDR footprints only.

FIELD_DELIMETER

Indicates the single character used to separate the fields within the spreadsheet. Applies to RDR footprints only.

FIELD_NUMBER

The sequential number of the enclosing field object within the spreadsheet definition. Applies to RDR footprints only.

FIELDS

Specifies the number of field objects defined within the spreadsheet object. Applies to RDR footprints only.

FILE_RECORDS

The file_records element indicates the number of physical file records in the detached data file.

INSTRUMENT_HOST_NAME

Provides the full name of the host on which an instrument is based. In this case, “MESSENGER”.

INSTRUMENT_ID

Unique id associated with the instrument. In this case, "XRS".

INSTRUMENT_NAME

Full, unabbreviated name of the instrument. In this case, "XRAY SPECTROMETER".

INTERCHANGE_FORMAT

Identifies the manner in which the data items are stored.

MISSION_PHASE_NAME

The MISSION_PHASE_NAME provides the commonly-used identifier of a mission phase. Applies to CDRs and RDR Maps only.

NAME

The term used to define the field or image.

OBJECT

Specifies the type of CDR or RDR object. This object contains its own elements which are defined below. Note: The end of the object definition is always marked with an END_OBJECT line.

PDS_VERSION_ID

Represents the version number of the PDS standards document that is valid when a data product label is created. PDS3 is used for the MESSENGER data products.

PRODUCT_CREATION_TIME

Stores the time the data product was created, in GMT time.

PRODUCT_ID

The product_id data element represents a permanent, unique identifier assigned to a data product by its producer.

Note: In the PDS, the value assigned to product_id must be unique within its data set.

PRODUCT_TYPE

Identifies the type or category of a product within a data set. In this case, CDR (Calibrated Data Record) or RDR (Reduced Data Record).

PRODUCT_VERSION_ID

The product_version_id element identifies the version of an individual product within a data set. Example: 1.0, 2A, 1.2.3C.

Note: This is not the same as the data set version that is an element of the data_set_id value. Product_version_id is intended to identify separate iterations of a given product, which also have a unique file_name.

RECORD_BYTES

This element indicates the number of bytes in a physical file record, including record terminators and separators.

RECORD_TYPE

The record_type element indicates the record format of a file.

ROW_BYTES

Specifies the number of bytes for each row in the table or spreadsheet.

ROWS

Specifies the number of rows (records) in the table or spreadsheet.

SOFTWARE_NAME

Identifies the name and version number of the software system that created the data products.

SOFTWARE_VERSION_ID

Version number of the program or program library used by the instrument to collect observations.

SPACECRAFT_CLOCK_START_COUNT

Clock count of the spacecraft computer at the start of the observation.

SPACECRAFT_CLOCK_STOP_COUNT

Clock count of the spacecraft computer at the end of the observation.

SPREADSHEET

Identifies the name of the RDR footprint file that contains the data in CSV format.

STANDARD_DATA_PRODUCT_ID

Used to link a data product (file) to a standard data product (collection of similar files) described within software interface specification document for a particular data set.

START_TIME

Start time of the observation.

STOP_TIME

Time when the instrument stopped collecting measurements.

STRUCTURE

Pointer to the external file which provides the structure definition for the table object. This applies to CDR labels only.

TABLE

Identifies the name of the CDR file that contains the data in BINARY table format. The structure of the data file is defined in a referenced description text file. This applies to CDR labels only.

TARGET_NAME

Target of the observation.

UNIT

The unit of measurement in which the value is expressed.

5.5.2 Binary Table File Formats

Each XRS CDR PDS label contains a pointer to the XRS_CDR.FMT external file. This file describes the structure of the XRS binary table that includes column name, byte size, data type, applicable units, and a description of the value assigned to the column.

5.5.3 Format File Keyword Definitions

The following describes the keywords used in the XRS_CDR.FMT file:

OBJECT

Identifies the object as a column field within a binary table.

COLUMN_NUMBER

Identifies the location of the column within the larger table data object. For tables consisting of rows (I= 1, N) and columns (j = 1, M), the column_number is the j-th index of any row.

NAME

Indicates a literal value representing the common term used to identify an element or object.

Note: In the PDS data dictionary, name is restricted to 30 characters and must conform to PDS nomenclature standards.

BYTES

Specifies the total number of bytes allocated for this particular column element.

DATA_TYPE

Specifies the internal representation and/or mathematical properties of the value being stored in this column.

START_BYTE

Identifies the location of the first byte of the particular column, counting from 1.

ITEMS

Defines the number of multiple, identical occurrences of a single data item.

ITEM_BYTES

Represents the size in each individual item within the column field.

DESCRIPTION

Describes the value(s) stored in the column object.

5.6 Directory Structure and Contents for Static Volumes

The following illustration shows the directory structure for the CDR archive volume. Below the root directory are the DOCUMENT, INDEX, CATALOG, DATA, LABEL, CALIB and SOFTWARE directories. A detailed description of the directory tree is provided in the figure below. Empty directories are not included on the volume. (Empty directories occur when no data was received for a given day in which data was expected.)

The directory structure for the RDR products is the same with the exception that the LABEL and SOFTWARE directories are omitted. Rather than grouped in subdirectories by date, the RDR Map products are in a single subdirectory of DATA called MAPS. The RDR Footprint products are in a single subdirectory of DATA called FOOTPRINTS. Within the FOOTPRINTS subdirectory, the footprint products are organized based on the UTC time corresponding to the start time of the CDR observation from which the footprint is derived. The subdirectories are organized by year, month, day, and hour. An observation from 2013-01-02-03:04:05 would be stored in DATA/FOOTPRINTS/2013/01/02/03.

Figure 3. Directory Structure Overview

5.6.1 Directory Contents

<ROOT> Directory

AAREADME.TXT - General information file. Provides users with information about the MESSENGER XRS data products. Directs user to more detailed documents on the volume.

VOLDESC.CAT - PDS file containing labels that describe the volume data products. Information includes: production date, producer name and institution, volume ID, etc.

ERRATA.TXT - Text file for tracking and recording discovered errors in the MESSENGER XRS data products.

<CALIB> Directory

CALINFO.TXT - Description of calib directory files. Calibration files are either used to create or process the data products.

<CATALOG> Directory

CATINFO.TXT - Description of catalog directory files.

*.CAT - Description of PDS catalog mission, spacecraft, instrument and data sets as ASCII text files in PDS-specified formats, to be entered into the PDS online catalog for searching.

<DATA> - Data Directory

This is the top level of the directories containing CDRs or RDRs.

<DATA/YYYY> - Data Directories

Sub-directories of the <DATA> directory for each year. (CDR volume only)

<DATA/YYYY/MM> - Data Directories

Sub-directories of the <DATA> directory for each month of a year, where MM is from 01 through 12. (CDR volume only)

<DATA/YYYY/MM/DD> - Data Directories

Sub-directories of a <DATA/YYYY/MM> directory, these are the top level directories for the CDR data products. The names of the data directories identify the day of the month for the start time of the data products contained in the directories. (CDR volume only)

<DATA/MAPS> - Data Directory

Sub-directory of the <DATA> directory for the map products. (RDR volume only)

<DATA/FOOTPRINTS/YYYY/MM/DD/HH> - Data Directory

Sub-directories of the <DATA> directory for the footprint products. (RDR volume only)

<DOCUMENT> Directory

DOCINFO.TXT - DOCUMENT directory description.

The documentation files exist in several forms in order to facilitate access to the documents:

· Extension 'TXT' or 'ASC' - ASCII text files (that virtually all text editors can read).

· Extension 'PDF' - Adobe Portable Document File.

· Extension ‘HTM’ - Hypertext Markup files, which are read in a web browser.

<SIS> - Subdirectory that contains the Software Interface Specification for the CDR and RDR XRS data products in PDF and HTML formats. Also contains an <IMAGES> subdirectory that is referenced by the HTML version of the document.

<ED2CD2RD> - Subdirectory that contains the EDR to CDR to RDR document in PDF and HTML formats. This document describes the conversion of Experiment Data Records (EDRs) to Calibrated Data Records (CDRs) to Reduced Data Records (RDRs).

<INDEX> Directory

INDXINFO.TXT - Text file describing contents of <INDEX> directory.

INDEX.TAB - The CDR or RDR index file is organized as a table. In the table, there is a row for each observation on the volume. The table columns contain parameters that describe the observation and instrument and spacecraft parameters.

INDEX.LBL - Detached PDS label for INDEX.TAB. It contains the INDEX_TABLE object which identifies and describes the columns of the GRS index table. See section 5.3.

MD5.TAB - Contains the cumulative MD5 checksums for the archive volume.

MD5.LBL - Detached PDS label for MD5.TAB.

<LABEL> Directory (CDR only)

LABINFO.TXT - Description of label directory files that include additional PDS labels and files not packaged with the data products.

XRS_CDR.FMT - Format file describing the XRS calibrated data records.

<SOFTWARE> Directory (CDR only)

SOFTINFO.TXT - Description of software that can be used to view the data products and where to obtain it.

5.6.2 Data Product Sizes

The following table shows sizes in bytes of each data product and total estimated size of the GRS CDR and RDR data sets.

Table 1. Data Product Sizes

Product Type	Time span covered	Typical product size (bytes)	Estimated mission total (byte)
XRS_CDR	1 Earth day	936700	346579000
XRS_RDR_MAPS	Mercury orbit year 1 and a portion of year 2	250000	5120000
XRS_RDR_FOOTPRINTS	1 CDR observation	12288	4324053323

6 Product Delivery

6.1 Product Delivery Mechanism

The XRS CDR and RDR volumes were delivered to Applied Coherent Technologies (ACT) in a file that has been created with gzip and tar. This file was delivered on a periodic basis to ACT. ACT extracted the volumes from the delivered file and created the index files. The initial delivery had in the .LBL files a PRODUCT_VERSION_ID of 1.0 and a SOFTWARE_VERSION_ID of 1.0.

6.2 Product Redelivery

The products were redelivered to ACT when a previously delivered product changed. Reasons for redelivery included:

· The software that converts the EDRs into CDRs or CDRs into RDRs changed. This resulted in a change to the data delivered. The PRODUCT_VERSION_ID and the SOFTWARE_VERSION_ID were incremented by 1 in the .LBL files of the redelivered product.

· The data in the DATA_QUALITY column in a XRSCDRYYYYDDD.DAT changed. The PRODUCT_VERSION_ID was incremented by 1 in the .LBL files of the redelivered product.

· XRS_CDR_RDR_SIS document changed.

XRS_EDR2CDR2RDR document changed.

7 Appendicies

7.1 APPENDIX: SPICE Kernel Files Used in MESSENGER Data Products

SPICE kernel files are inputs to the spatial and temporal data archived in this volume set. Improvements to some of these fundamental ancillary data were made as further analysis of MESSENGER data continued, so there were reprocessing releases of CDR or RDR volumes. The MESSENGER SPICE kernels are archived in a separate volume (MESSSP_1000) located at the PDS NAIF node.

7.2 APPENDIX: CODMAC/NASA Definition of Processing Levels

Table 2. CODMAC/NASA Definition of Processing Levels for Science Data Sets

CODMAC Level	Proc. Type	Data Processing Level Description
1	Raw Data	Telemetry data stream as received at the ground station, with science and engineering data embedded. Corresponds to NASA packet data.
2	Edited Data	Instrument science data (e.g. raw voltages, counts) at full resolution, time ordered, with duplicates and transmission errors removed. Referred to in the MESSENGER program as Experiment Data Records (EDRs). Corresponds to NASA Level 0 data.
3	Calibrated Data	Edited data that are still in units produced by instrument, but have been transformed (e.g. calibrated, rearranged) in a reversible manner and packaged with needed ancillary and auxiliary data (e.g. radiances with calibration equations applied). Referred to in the MESSENGER Program as Calibrated Data Records (CDRs). In some cases, these also qualify as derived data products (DDRs). Corresponds to NASA Level 1A.
4	Resampled data	Irreversibly transformed (e.g. resampled, remapped, calibrated) values of the instrument measurements (e.g. radiances, magnetic field strength). Referred to in the MESSENGER program as either derived data products (DDPs) or derived analysis products (DAPs). Corresponds to NASA Level 1B.
5	Derived Data	Derived results such as maps, reports, graphics, etc. Corresponds to NASA Levels 2 through 5.
6	Ancillary Data	Non-Science data needed to generate calibrated or resampled data sets. Consists of instrument gains, offsets, pointing information for scan platforms, etc.
7	Corrective Data	Other science data needed to interpret space-borne data sets. May include ground based data observations, such as soil type or ocean buoy wind drift measurements.
8	User Description	Description of why the data is required, any peculiarities associated with the data sets and enough documentation to allow the secondary user to extract information from the data.

The above is based on the national research council committee on data management and computational (CODMAC) data levels.

7.3 APPENDIX: MESSENGER XRS Glossary and Acronym List

ACT Applied Coherent Technology Corporation

APL The Johns Hopkins University Applied Physics Laboratory

ASCII American Standard Code for Information Interchange

ATDF Archival Tracking Data File

B-frame Body Frame

C&DH Command and Data Handler

CA Closest Approach

CCSDS Consultative Committee for Space Data Systems

CDF Common Data Format

CDR Calibrated Data Record

CFDP CCSDS File Delivery Protocol

CK Camera Kernel (SPICE)

CODMAC Committee on Data Management and Computation

Co-I Co-Investigator

COP Command Operation Procedure

CUCC CSDS Unsegmented Time Code

DPU Data Processing Unit

EDR Experiment Data Record

EK Event Kernel

ET Ephemeris Time

FIPS Fast Imaging Plasma Spectrometer

FITS Flexible Image Transport System

FOP Frame Operation Procedure

FOV Field-of-View

FTP File Transfer Protocol

GPC Gas Proportional Counter

GSFC Goddard Space Flight Center

I&T Integration and Test

I2C Inter-Integrated Circuit

IEM Integrated Electronic Module

IK Instrument Measurement Kernel (SPICE)

IMU Inertial Measurement unit

ISI Integral Systems Incorporated (EPOCH)

LSK Leap seconds Kernel (SPICE)

LVPS Low Voltage Power Supply

MCP Monitor and Control Processor (DSN station)

MESSENGER MErcury, Surface, Space ENvironment, GEochemistry, and Ranging

MET Mission Elapsed Time

MIA Monitor Interface Assembly (DSN station)

MXU Mercury X-ray Unit

NAIF Navigation and Ancillary Information Facility

NASA Navigation Aeronautics and Space Administration

NSSDC National Space Science Data Center

ODF Orbit Data File

ODL Object Description Language

OWLT One-Way Light Time

PCK Planetary Constant Kernel (SPICE)

PDR Packetized Data Records

PDS Planetary Data System

PIN Positive-Intrinsic-Negative silicon diode

RDR Reduced Data Record

SAX Solar Assembly for X-rays

SCET Space Craft Event Time

SCLK Space Clock Kernel (SPICE)

SCPS Space Communication Protocol Standards

SFDU Standard Formatted Data Unit

SPICE Spacecraft, Planet, Instrument, C-matrix, Events

SPK Spacecraft and Planets Kernel (SPICE)

TDB Barycentric Dynamical Time, the same as ET in the SPICE system

TEC Thermal Electric Cooler

UTC Coordinated Universal Time

XRS X-Ray Spectrometer

Table 3. XRS CDR Data Types

Column Name	Data Type	Length	Units	Description	Appears In
ACTUAL_INTEGRATION_TIME	MSB_UNSIGNED_INTEGER	4	Second	"Actual integration period in seconds."	XRS_CDR
ACTUAL_REPORTING_TIME	MSB_UNSIGNED_INTEGER	4	Second	"Actual reporting time in seconds."	XRS_CDR
ALARM_COUNT	MSB_UNSIGNED_INTEGER	1		"Count of number of alarms."	XRS_CDR
ALARM_ID	MSB_UNSIGNED_INTEGER	1		"the identifier for the last XRS alarm, 0 for no alarm and non-zero for a long list of various parameters out of range."	XRS_CDR
ALARM_TYPE	MSB_UNSIGNED_INTEGER	1		"Latest alarm type. =0 persistent, =1 transient."	XRS_CDR
ANALOG_MINUS_5V	IEEE_REAL	8	Volt	"Analog -5 volt monitor, smoothed."	XRS_CDR
ANALOG_PLUS_5V	IEEE_REAL	8	Volt	"Analog +5 volt monitor, smoothed."	XRS_CDR
ANGLE_SUN_SOLAR_MONITOR	IEEE_REAL	4	Degree	"Angle between the Sun and the solar monitor."	XRS_CDR
AVG_EMISSION_ANGLE	IEEE_REAL	4	Degree	"Average emission angle (between normal to the surface and direction from the surface to the spacecraft)."	XRS_CDR
AVG_INC_EMI_COS_RATIO	IEEE_REAL	4		"Average ratio of the cosine of incidence angle to the cosine of emission angle."	XRS_CDR
AVG_INCIDENCE_ANGLE	IEEE_REAL	4	Degree	"Average incidence angle."	XRS_CDR
AVG_SC_DISTANCE	IEEE_REAL	4	Kilometer	"Average distance of the planet from the Spacecraft."	XRS_CDR
BIAS_SUPPLY_TEMP	IEEE_REAL	8	Degree(C)	"Bias supply temperature measurement, smoothed."	XRS_CDR
BIAS_SUPPLY_VOLT_STEPPING	MSB_UNSIGNED_INTEGER	1		"Indicates whether the Bias detector's high voltage state is seeking. See the MESSENGER XRS Software Specification document for an explanation of the seeking state. =0 no, =1 yes."	XRS_CDR
BIAS_VOLTAGE	IEEE_REAL	8	Volt	"Bias voltage measurement, smoothed."	XRS_CDR
BIAS_VOLTAGE_SETTING	MSB_UNSIGNED_INTEGER	2		"Bias voltage setting."	XRS_CDR
BS_VECTOR_X	IEEE_REAL	4		"Boresight vector, x component in the J2000 frame."	XRS_CDR
BS_VECTOR_Y	IEEE_REAL	4		"Boresight vector, y component in the J2000 frame."	XRS_CDR
BS_VECTOR_Z	IEEE_REAL	4		"Boresight vector, z component in the J2000 frame."	XRS_CDR
CMD_EXECUTED	MSB_UNSIGNED_INTEGER	1		"Number of commands executed."	XRS_CDR
CMD_REJECTED	MSB_UNSIGNED_INTEGER	1		"Number of commands rejected."	XRS_CDR
DATA_QUALITY	MSB_UNSIGNED_INTEGER	4		"Integer representation of a 32-bit array. Each bit represents a data quality flag. Currently only the least significant bit is being used. Other bit positions will be designated during the course of the mission as more data quality parameters are identified by the instrument team. =1, the actual data length in bytes does not match the reported length. =0, actual data length in bytes matches reported length."	XRS_CDR
DAY_INDEX	MSB_UNSIGNED_INTEGER	2		"Day of Mercury year."	XRS_CDR
DEBUG_COUNTERS	MSB_UNSIGNED_INTEGER	1		"Diagnostic for planetary sensor. =0 disabled, =1 enabled."	XRS_CDR
DELTA_ANGLE	IEEE_REAL	8	Degree	"Difference between instrument +y direction and true north at the middle of the pixel."	XRS_CDR
DIGITAL_PLUS_5V	IEEE_REAL	8	Volt	"Digital +5 volt monitor, smoothed."	XRS_CDR
DISCARDED_PACKET_COUNTER	MSB_UNSIGNED_INTEGER	1		"Number of calls to send-pkt that resulted in a return value of false."	XRS_CDR
EARTH_POSITION_X	IEEE_REAL	4		"Position of the Earth (ET) in Mercury fixed coord. system (ET)."	XRS_CDR
EARTH_POSITION_Y	IEEE_REAL	4		"Position of the Earth (ET) in Mercury fixed coord. system (ET)."	XRS_CDR
EARTH_POSITION_Z	IEEE_REAL	4		"Position of the Earth (ET) in Mercury fixed coord. system (ET)."	XRS_CDR
FLARE_HANDLING_ENABLED	MSB_UNSIGNED_INTEGER	1		"Solar flare handling enabled flag, software checks this value upon detection of a solar flare. =0 do not handle solar flare detection. =1 continue algorithm for handling solar flare detection (see SOLAR_FLARE_ENACT)."	XRS_CDR
FLARE_HANDLING_ENACTED	MSB_UNSIGNED_INTEGER	1		"Solar flare handling enacted flag. Allows software to determine if solar flare handling has already been enacted or whether this is a new detection of a solar flare. Only checked if solar flare handling has been enabled (see previous field). =0 the software sets it to true, starts the sf-time-enactable-left counter out at sf-max-time-enactable, sets a flag telling the 1Hz process to end the current integration and reporting period immediately, and returns control to the 1Hz process. =1 , the software decrements the sf-time-enactable-left counter and checks its value. If sf-time-enactable-left is still greater than 0, the algorithm does nothing further. If sf-time-enactable-left has reached 0, the algorithm starts the sf-timeout-left counter out at sf-timeout-period and sets the sf-handling-enacted-now flag to false."	XRS_CDR
FOOTPRINT_SOLID_ANGLE	IEEE_REAL	4	Steradian	"Overall solid angle of the footprint contributing to the spectrum (visible from the spacecraft), relative to the instrument full field of view."	XRS_CDR
FOV_STATUS	MSB_UNSIGNED_INTEGER	1		"Field of view 0 equals Field of view (FOV) is completely off the planet. 1 equals The field of view is totally on the planet and at least part of the footprint is lit by the sun. 2 equals The field of view is totally on the planet and is dark. (planet darkside). 3 equals Part of the field of view is off the planet and at least one plate is lit by the sun. 4 equals Part of the field of view is off the planet and is are dark."	XRS_CDR
GPC1_MG_ANALYZED_EVENT_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG analyzed event rate per integration period."	XRS_CDR
GPC1_MG_CENTER_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG center anode rate per integration period."	XRS_CDR
GPC1_MG_ENABLE	MSB_UNSIGNED_INTEGER	1		"ENABLE criterion to determine valid event for GPC1_MG detector. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_HIGH_ENERGY_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG high energy rate per integration period."	XRS_CDR
GPC1_MG_LIVE_TIME	IEEE_REAL	4	Second	"Mg filtered Xray actual integration time (sec.) - the."	XRS_CDR
GPC1_MG_LOSS_PERCENTAGE	MSB_UNSIGNED_INTEGER	1		"GPC1-MG loss percentage."	XRS_CDR
GPC1_MG_LOW_LEVEL_DISC	MSB_UNSIGNED_INTEGER	1		"GPC1-MG low level discriminator."	XRS_CDR
GPC1_MG_MINUS_5V	IEEE_REAL	8	Volt	"GPC1-MG -5 volt monitor, smoothed."	XRS_CDR
GPC1_MG_PILEUP_ENABLE	MSB_UNSIGNED_INTEGER	1		"PILEUP ENABLE criterion to determine valid event for GPC1_MG detector. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG pileup rate per integration period."	XRS_CDR
GPC1_MG_PLUS_5V	IEEE_REAL	8	Volt	"GPC1-MG +5 volt monitor, smoothed."	XRS_CDR
GPC1_MG_POWER_ANALOG	MSB_UNSIGNED_INTEGER	1		"GPC1-MG analog power setting. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_POWER_HVPS	MSB_UNSIGNED_INTEGER	1		"GPC1-MG HVPS power setting, =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_REAL_GAIN	IEEE_REAL	4	Kiloelectron-Volt/Ch.	"Measured gain of GPC1-Mg detector in keV/ch."	XRS_CDR
GPC1_MG_REAL_ZERO	IEEE_REAL	4	Kiloelectron-Volt	"Measured zero offset of GPC1-Mg detector in keV."	XRS_CDR
GPC1_MG_RISE_PILEUP	MSB_UNSIGNED_INTEGER	1		"RISE PILEUP criterion to determine valid event for GPC1_MG detector. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_RISE_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG rise pileup rate per integration period."	XRS_CDR
GPC1_MG_RISE_TIME	MSB_UNSIGNED_INTEGER	1		"RISE TIME criterion to determine valid event for GPC1_MG detector. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_RISE_TIME_CHANNEL	IEEE_REAL	4		"Mg filtered Xray rise time valid discriminator threshold; events with energy exceeding the threshold will be rejected based on the rise time discrimination flag - the most recently cmded value for this."	XRS_CDR
GPC1_MG_RISE_TIME_DISC_1	MSB_UNSIGNED_INTEGER	1		"GPC1-MG rise time discriminator 1."	XRS_CDR
GPC1_MG_RISE_TIME_DISC_2	MSB_UNSIGNED_INTEGER	1		"GPC1-MG rise time discriminator 2."	XRS_CDR
GPC1_MG_RISE_TIME_REJECT	MSB_UNSIGNED_INTEGER	4		"GPC1-MG rise time reject rate per integration period."	XRS_CDR
GPC1_MG_SAFING_LEVEL	MSB_UNSIGNED_INTEGER	1		"The safing level set for the GPC1-MG detector. =0 level zero or nominal level safing; the software will monitor the planetary detector for the conditions which necessitate a higher level of safing. =1 level 1 safing; the HVPS voltage level for the affected sensor is ramped down to 0 at a rate of 100 V/sec. =2 level 2 safing; the software turns off analog power to the affected sensor and turns off the associated HVPS. No further attempts are made to restore the level-two-safed sensor to nominal safing. The software waits for ground command to reset the affected HVPS voltage levels."	XRS_CDR
GPC1_MG_SAFING_RETRY	MSB_UNSIGNED_INTEGER	1		"The max number of retry attempts to reset the GPC1-MG detector to level 0 safing."	XRS_CDR
GPC1_MG_SPARE_RATE_1	MSB_UNSIGNED_INTEGER	4		"Spare column for GPC1-MG rates per integration period."	XRS_CDR
GPC1_MG_SPARE_RATE_2	MSB_UNSIGNED_INTEGER	4		"Spare column for GPC1-MG rates."	XRS_CDR
GPC1_MG_SPECTRUM_10_253	MSB_UNSIGNED_INTEGER	488		"GPC1-MG spectra channels (10-253)."	XRS_CDR
GPC1_MG_SUPPLY_TEMP	IEEE_REAL	8	Degree(C)	"GPC1-MG supply temperature measurement, smoothed."	XRS_CDR
GPC1_MG_VALID_CHANNEL_HI	IEEE_REAL	4		"Mg filtered Xray rise time valid discriminator threshold; events with energy exceeding the threshold will be rejected based on the rise time discrimination flag - the most recently cmded value for this."	XRS_CDR
GPC1_MG_VALID_CHANNEL_LOW	IEEE_REAL	4		"Mg filtered Xray lower level discriminator threshold; events with energy less than the threshold will be rejected - the most recently cmded value for this threshold."	XRS_CDR
GPC1_MG_VALID_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG valid rate per integration period."	XRS_CDR
GPC1_MG_VETO_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG veto anode rate per integration period."	XRS_CDR
GPC1_MG_VETO_DISC	MSB_UNSIGNED_INTEGER	1		"GPC1-MG veto discriminator."	XRS_CDR
GPC1_MG_VETO_ENABLE	MSB_UNSIGNED_INTEGER	1		"VETO ENABLE criterion to determine valid event for GPC1_MG detector. =0 disabled, =1 enabled."	XRS_CDR
GPC1_MG_VETO_RATE	MSB_UNSIGNED_INTEGER	4		"GPC1-MG veto rate per integration period."	XRS_CDR
GPC1_MG_VOLTAGE	IEEE_REAL	8	Volt	"GPC1-MG voltage measurement, smoothed."	XRS_CDR
GPC1_MG_VOLTAGE_SETTING	MSB_UNSIGNED_INTEGER	2		"GPC1-MG voltage setting."	XRS_CDR
GPC1_MG_VOLTAGE_STEPPING	MSB_UNSIGNED_INTEGER	1		"Indicates whether the GPC1-MG detector's high voltage state is seeking. See the MESSENGER XRS Software Specification document for an explanation of the seeking state. =0 no, =1 yes."	XRS_CDR
GPC2_AL_ANALYZED_EVENT_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL analyzed event rate per integration period."	XRS_CDR
GPC2_AL_CENTER_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL center anode rate per integration period."	XRS_CDR
GPC2_AL_ENABLE	MSB_UNSIGNED_INTEGER	1		"ENABLE criterion to determine valid event for GPC2_AL detector. =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_HIGH_ENERGY_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL high energy rate per integration period."	XRS_CDR
GPC2_AL_LIVE_TIME	IEEE_REAL	4	Second	"Al filtered Xray actual integration time- the portion of the period covered by this record in which the Al Xray sensor was unmasked and Integrating."	XRS_CDR
GPC2_AL_LOSS_PERCENTAGE	MSB_UNSIGNED_INTEGER	1		"GPC2-AL loss percentage."	XRS_CDR
GPC2_AL_LOW_LEVEL_DISC	MSB_UNSIGNED_INTEGER	1		"GPC2-AL low level discriminator."	XRS_CDR
GPC2_AL_MINUS_5V	IEEE_REAL	8	Volt	"GPC2-AL -5 volt monitor, smoothed."	XRS_CDR
GPC2_AL_PILEUP_ENABLE	MSB_UNSIGNED_INTEGER	1		"PILEUP_ENABLE criterion to determine valid event for GPC2_AL detector. =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL pileup rate per integration period."	XRS_CDR
GPC2_AL_PLUS_5V	IEEE_REAL	8	Volt	"GPC2-AL +5 volt monitor, smoothed."	XRS_CDR
GPC2_AL_POWER_ANALOG	MSB_UNSIGNED_INTEGER	1		"GPC2-AL analog power setting, =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_POWER_HVPS	MSB_UNSIGNED_INTEGER	1		"GPC2-AL HVPS power setting, =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_REAL_GAIN	IEEE_REAL	4	Kiloeltron-Volt/Ch.	"Measured gain of GPC2-Al detector in keV/ch."	XRS_CDR
GPC2_AL_REAL_ZERO	IEEE_REAL	4	Kiloelectron-Volt	"Measured zero offset of GPC2-Al detector in keV."	XRS_CDR
GPC2_AL_RISE_PILEUP	MSB_UNSIGNED_INTEGER	1		"RISE PILEUP criterion to determine valid event for GPC2_AL detector. =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_RISE_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL rise pileup rate per integration period."	XRS_CDR
GPC2_AL_RISE_TIME	MSB_UNSIGNED_INTEGER	1		"RISE TIME criterion to determine valid event for GPC2_AL detector. =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_RISE_TIME_CHANNEL	IEEE_REAL	4		"Al filtered X-Ray rise time channel."	XRS_CDR
GPC2_AL_RISE_TIME_DISC_1	MSB_UNSIGNED_INTEGER	1		"GPC2-AL rise time discriminator 1."	XRS_CDR
GPC2_AL_RISE_TIME_DISC_2	MSB_UNSIGNED_INTEGER	1		"GPC2-AL rise time discriminator 2."	XRS_CDR
GPC2_AL_RISE_TIME_REJECT	MSB_UNSIGNED_INTEGER	4		"GPC2-AL rise time reject rate per integration period."	XRS_CDR
GPC2_AL_SAFING_LEVEL	MSB_UNSIGNED_INTEGER	1		"The safing level set for the GPC2-AL detector. =0 level zero or nominal level safing; the software will monitor the planetary detector for the conditions which necessitate a higher level of safing. =1 level 1 safing; the HVPS voltage level for the affected sensor is ramped down to 0 at a rate of 100 V/sec. =2 level 2 safing; the software turns off analog power to the affected sensor and turns off the associated HVPS. No further attempts are made to restore the level-two-safed sensor to nominal safing. The software waits for ground command to reset the affected HVPS voltage levels."	XRS_CDR
GPC2_AL_SAFING_RETRY	MSB_UNSIGNED_INTEGER	1		The max number of retry attempts to reset the GPC2-AL detector to level 0 safing.	XRS_CDR
GPC2_AL_SPARE_RATE_1	MSB_UNSIGNED_INTEGER	4		"GPC2-AL spare rates column."	XRS_CDR
GPC2_AL_SPARE_RATE_2	MSB_UNSIGNED_INTEGER	4		"GPC2-AL spare rates column."	XRS_CDR
GPC2_AL_SPECTRUM_10_253	MSB_UNSIGNED_INTEGER	488		"GPC2-AL spectra channels (10-253)."	XRS_CDR
GPC2_AL_SUPPLY_TEMP	IEEE_REAL	8	Degree(C)	"GPC2-AL supply temperature measurement, smoothed."	XRS_CDR
GPC2_AL_VALID_CHANNEL_HI	IEEE_REAL	4		"Al filtered X-Ray rise time high channel."	XRS_CDR
GPC2_AL_VALID_CHANNEL_LOW	IEEE_REAL	4		"Al filtered X-Ray rise time low channel."	XRS_CDR
GPC2_AL_VALID_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL valid rate per integration period."	XRS_CDR
GPC2_AL_VETO_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL veto anode rate per integration period."	XRS_CDR
GPC2_AL_VETO_DISC	MSB_UNSIGNED_INTEGER	1		"GPC2-AL veto discriminator."	XRS_CDR
GPC2_AL_VETO_ENABLE	MSB_UNSIGNED_INTEGER	1		"VETO_ENABLE criterion to determine valid event for GPC2_AL detector. =0 disabled, =1 enabled."	XRS_CDR
GPC2_AL_VETO_RATE	MSB_UNSIGNED_INTEGER	4		"GPC2-AL veto rate per integration period."	XRS_CDR
GPC2_AL_VOLTAGE	IEEE_REAL	8	Volt	"GPC2-AL voltage measurement, smoothed."	XRS_CDR
GPC2_AL_VOLTAGE_SETTING	MSB_UNSIGNED_INTEGER	2		"GPC2-AL voltage setting."	XRS_CDR
GPC2_AL_VOLTAGE_STEPPING	MSB_UNSIGNED_INTEGER	1		"Indicates whether the GPC2-AL detector's high voltage state is seeking. See the MESSENGER XRS Software Specification document for an explanation of the seeking state. =0 no, =1 yes."	XRS_CDR
GPC3_UN_ANALYZED_EVENT_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN analyzed event rate per integration period."	XRS_CDR
GPC3_UN_CENTER_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN center anode rate per integration period."	XRS_CDR
GPC3_UN_ENABLE	MSB_UNSIGNED_INTEGER	1		"ENABLE criterion to determine valid event for GPC3_UN detector. =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_HIGH_ENERGY_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN high energy rate per integration period."	XRS_CDR
GPC3_UN_LIVE_TIME	IEEE_REAL	4	Second	"Unfiltered Xray actual integration time (sec.) - the portion of the period covered by this record in which the unfiltered Xray sensor was unmasked and integrating."	XRS_CDR
GPC3_UN_LOSS_PERCENTAGE	MSB_UNSIGNED_INTEGER	1		GPC3-UN loss percentage."	XRS_CDR
GPC3_UN_LOW_LEVEL_DISC	MSB_UNSIGNED_INTEGER	1		"GPC3-UN low level discriminator."	XRS_CDR
GPC3_UN_MINUS_5V	IEEE_REAL	8	Volt	"GPC3-UN -5 volt monitor, smoothed."	XRS_CDR
GPC3_UN_PILEUP_ENABLE	MSB_UNSIGNED_INTEGER	1		"PILEUP ENABLE criterion to determine valid event for GPC3_UN detector. =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN pileup rate per integration period."	XRS_CDR
GPC3_UN_PLUS_5V	IEEE_REAL	8	Volt	"GPC3-UN +5 volt monitor, smoothed."	XRS_CDR
GPC3_UN_POWER_ANALOG	MSB_UNSIGNED_INTEGER	1		"GPC3-UN analog power setting."	XRS_CDR
GPC3_UN_POWER_HVPS	MSB_UNSIGNED_INTEGER	1		"GPC3-UN HVPS power setting, =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_REAL_GAIN	IEEE_REAL	4	Kiloelectron-Volt/Ch.	"Measured gain of GPC3-UN detector in keV/ch."	XRS_CDR
GPC3_UN_REAL_ZERO	IEEE_REAL	4	Kiloelectron-Volt	"Measured zero offset of GPC3-UN detector in keV."	XRS_CDR
GPC3_UN_RISE_PILEUP	MSB_UNSIGNED_INTEGER	1		"RISE PILEUP criterion to determine valid event for GPC3_UN detector. =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_RISE_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN rise pileup rate per integration period."	XRS_CDR
GPC3_UN_RISE_TIME	MSB_UNSIGNED_INTEGER	1		"RISE TIME criterion to determine valid event for GPC3_UN detector. =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_RISE_TIME_CHANNEL	IEEE_REAL	4		"Rise time threshold channel in the new (after calibration) energy scale."	XRS_CDR
GPC3_UN_RISE_TIME_DISC_1	MSB_UNSIGNED_INTEGER	1		"GPC3-UN rise time discriminator 1."	XRS_CDR
GPC3_UN_RISE_TIME_DISC_2	MSB_UNSIGNED_INTEGER	1		"GPC3-UN rise time discriminator 2."	XRS_CDR
GPC3_UN_RISE_TIME_REJECT	MSB_UNSIGNED_INTEGER	4		"GPC3-UN rise time reject rate per integration period."	XRS_CDR
GPC3_UN_SAFING_LEVEL	MSB_UNSIGNED_INTEGER	1		The safing level set for the GPC3-UNfiltered (UN) detector. =0 level zero or nominal level safing; the software will monitor the planetary detector for the conditions which necessitate a higher level of safing. =1 level 1 safing; the HVPS voltage level for the affected sensor is ramped down to 0 at a rate of 100 V/sec. =2 level 2 safing; the software turns off analog power to the affected sensor and turns off the associated HVPS. No further attempts are made to restore the level-two-safed sensor to nominal safing. The software waits for ground command to reset the affected HVPS voltage levels.	XRS_CDR
GPC3_UN_SAFING_RETRY	MSB_UNSIGNED_INTEGER	1		"The max number of retry attempts to reset the GPC3-UN detector to level 0 safing."	XRS_CDR
GPC3_UN_SPARE_RATE_1	MSB_UNSIGNED_INTEGER	4		"Spare column for GPC3-UN rates."	XRS_CDR
GPC3_UN_SPARE_RATE_2	MSB_UNSIGNED_INTEGER	4		"Spare column for GPC3-UN rates.	XRS_CDR
GPC3_UN_SPECTRUM_10_253	MSB_UNSIGNED_INTEGER	488		"GPC3-UN spectra channels (10-253)."	XRS_CDR
GPC3_UN_SUPPLY_TEMP	IEEE_REAL	8	Degree(C)	"GPC3-UN supply temperature measurement, smoothed."	XRS_CDR
GPC3_UN_VALID_CHANNEL_HI	IEEE_REAL	4		"Highest channel of the spectrum in original (no calibration) or new (after calibration) energy scale."	XRS_CDR
GPC3_UN_VALID_CHANNEL_LOW	IEEE_REAL	4		"Lowest channel of the spectrum in original (no calibration) or new (after calibration) energy scale."	XRS_CDR
GPC3_UN_VALID_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN valid rate per integration period."	XRS_CDR
GPC3_UN_VETO_ANODE_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN veto anode rate per integration period."	XRS_CDR
GPC3_UN_VETO_DISC	MSB_UNSIGNED_INTEGER	1		"GPC3-UN veto discriminator."	XRS_CDR
GPC3_UN_VETO_ENABLE	MSB_UNSIGNED_INTEGER	1		"VETO ENABLE criterion to determine valid event for GPC3_UN detector. =0 disabled, =1 enabled."	XRS_CDR
GPC3_UN_VETO_RATE	MSB_UNSIGNED_INTEGER	4		"GPC3-UN veto rate per integration period."	XRS_CDR
GPC3_UN_VOLTAGE	IEEE_REAL	8	Volt	"GPC3-UN voltage measurement, smoothed."	XRS_CDR
GPC3_UN_VOLTAGE_SETTING	MSB_UNSIGNED_INTEGER	2		"GPC3-UN voltage setting."	XRS_CDR
GPC3_UN_VOLTAGE_STEPPING	MSB_UNSIGNED_INTEGER	1		"Indicates whether the GPC3-UN detector's high voltage state is seeking. See the MESSENGER XRS Software Specification document for an explanation of the seeking state. =0 no, =1 yes."	XRS_CDR
HERMEOCENTRIC_LATITUDE	IEEE_REAL	8	Degree	"Sub spacecraft latitude in Mercury fixed coordinates at the middle of the pixel."	XRS_CDR
HERMEOCENTRIC_LONGITUDE	IEEE_REAL	8	Degree	"Sub spacecraft longitude in Mercury fixed coordinated at the middle of the pixel. Longitude increases towards the East."	XRS_CDR
I2C_BUS_ERROR_COUNT	MSB_UNSIGNED_INTEGER	1		"I2C bus error count."	XRS_CDR
INSTR_BORESIGHT_MERCURY_X	IEEE_REAL	4	Kilometer	"Sub instrument boresight x component in Mercury fixed coordinates."	XRS_CDR
INSTR_BORESIGHT_MERCURY_Y	IEEE_REAL	4	Kilometer	"Sub instrument boresight y component in Mercury fixed coordinates."	XRS_CDR
INSTR_BORESIGHT_MERCURY_Z	IEEE_REAL	4	Kilometer	"Sub instrument boresight z component in Mercury fixed coordinates."	XRS_CDR
INTERSECTION	BOOLEAN	1		"True if the pointing vector intersects Mercury."	XRS_CDR
LOCAL_HOUR	MSB_UNSIGNED_INTEGER	1	Hour	"Local Sun hour at the sub-spacecraft point."	XRS_CDR
LOCAL_MINUTE	MSB_UNSIGNED_INTEGER	1	Minute	"Local Sun minute at the sub-spacecraft point."	XRS_CDR
LVPS_MINUS_12_I	IEEE_REAL	8	Microamp	"LVPS -12V current, smoothed."	XRS_CDR
LVPS_MINUS_12V	IEEE_REAL	8	Volt	"LVPS -12 volt monitor, smoothed."	XRS_CDR
LVPS_MINUS_5_I	IEEE_REAL	8	Microamp	"LVPS -5V current, smoothed."	XRS_CDR
LVPS_MINUS_5V	IEEE_REAL	8	Volt	"LVPS -5 volt monitor, smoothed."	XRS_CDR
LVPS_PLUS_12_I	IEEE_REAL	8	Microamp	"LVPS +12V current, smoothed."	XRS_CDR
LVPS_PLUS_12V	IEEE_REAL	8	Volt	"LVPS +12 volt monitor, smoothed."	XRS_CDR
LVPS_PLUS_5_I	IEEE_REAL	8	Microamp	"LVPS +5V current, smoothed."	XRS_CDR
LVPS_PLUS_5V	IEEE_REAL	8	Volt	"LVPS +5 volt monitor, smoothed."	XRS_CDR
LVPS_PRIMARY_I	IEEE_REAL	8	Microamp	"LVPS primary current, smoothed."	XRS_CDR
LVPS_SPARE0	MSB_UNSIGNED_INTEGER	1		"Spare unused column for LVPS monitoring."	XRS_CDR
LVPS_SPARE1	MSB_UNSIGNED_INTEGER	1		"Spare unused column for LVPS monitoring."	XRS_CDR
LVPS_SWITCHED_PRIMARY_I	IEEE_REAL	8	Microamp	"LVPS switched primary current, smoothed."	XRS_CDR
LVPS_TEMP	IEEE_REAL	8	Degree(C)	"LVPS temperature, smoothed."	XRS_CDR
MACRO_BLOCKS	MSB_UNSIGNED_INTEGER	2		"Number of macro blocks free."	XRS_CDR
MACRO_ID	MSB_UNSIGNED_INTEGER	1		"ID of most recent macro executed."	XRS_CDR
MACRO_LEARN_MODE	MSB_UNSIGNED_INTEGER	1		"Macro learn mode. =0 not learning, =1 learning."	XRS_CDR
MACROS_EXECUTED	MSB_UNSIGNED_INTEGER	1		"Number of macro commands executed."	XRS_CDR
MACROS_REJECTED	MSB_UNSIGNED_INTEGER	1		"Number of macro commands rejected."	XRS_CDR
MEM_WRITE_ENABLE	MSB_UNSIGNED_INTEGER	1		"Memory write enable. =0 disabled, =1 enabled."	XRS_CDR
MERCURY_SOL	IEEE_REAL	8		"Longitude of the Sun at 0 hours UT on the date of the record. Taken from the Association of Lunar and Planetary Observers Ephemeris for Physical Observation of Mercury."	XRS_CDR
MET	MSB_UNSIGNED_INTEGER	4	Second	"Time tag in seconds, 0 = MESSENGER launch."	XRS_CDR
MONITOR_RESPONSE	MSB_UNSIGNED_INTEGER	1		"Monitor response. =0 disabled, =1 enabled. This means whether the internal alarm autonomy is enabled for action. If there is an alarm, MONITOR_RESPONSE enabled means that the action macro, if there is one, will be executed. Disabled means that there can be an alarm detected and reported, but no action will take place within XRS to remove the error that causes the fault. The enable is off at startup, and is enabled shortly after boot by command, and should remain enabled. "	XRS_CDR
MXU_TEMP	IEEE_REAL	8	Degree(C)	"MXU temperature, smoothed."	XRS_CDR
ORBIT_NUMBER	MSB_UNSIGNED_INTEGER	4		"Orbit number is a unique identifier for a given orbit of the MESSENGER spacecraft around Mercury. Orbit number is defined as starting at apoherm and is calculated using the MET value and the appropriate SPICE kernels. Orbit numbering does not start until MESSENGER performs the Mercury orbit insertion. Until that time the value for orbit number is 0."	XRS_CDR
PHASE_ANGLE	IEEE_REAL	4	Degree	"Phase angle (between direction from the sun to the surface and direction from the surface to the spacecraft)."	XRS_CDR
PIN_ENABLE	MSB_UNSIGNED_INTEGER	1		"ENABLE criterion to determine valid event for PIN detector. =0 disabled, =1 enabled."	XRS_CDR
PIN_LOW_LEVEL_DISC	MSB_UNSIGNED_INTEGER	1		"PIN low level discriminator (energy threshold)."	XRS_CDR
PIN_PILEUP_ENABLE	MSB_UNSIGNED_INTEGER	1		"PIN PILEUP criterion to determine valid event for PIN detector. =0 disabled, =1 enabled."	XRS_CDR
PIN_POWER_ANALOG	MSB_UNSIGNED_INTEGER	1		"PIN analog power setting. =0 disabled, =1 enabled."	XRS_CDR
PIN_POWER_BIAS	MSB_UNSIGNED_INTEGER	1		"PIN power bias =0 disabled, =1 enabled."	XRS_CDR
PIN_TEC_ENABLE	MSB_UNSIGNED_INTEGER	1		"PIN TEC enable, =0 disabled, =1 enabled."	XRS_CDR
PIN_TEC_MODE	MSB_UNSIGNED_INTEGER	1		"PIN TEC mode, =0 cool, =1 heat."	XRS_CDR
POINTING	BOOLEAN	1		"True if pointing data was available."	XRS_CDR
SAX_LIVE_TIME	IEEE_REAL	4		"Live time of the solar monitor."	XRS_CDR
SAX_MINUS_5V	IEEE_REAL	8	Volt	"SAX -5 volt monitor, smoothed."	XRS_CDR
SAX_PLUS_5V	IEEE_REAL	8	Volt	"SAX +5 volt monitor, smoothed."	XRS_CDR
SAX_TEMP	IEEE_REAL	8	Degree(C)	"SAX temperature, smoothed."	XRS_CDR
SAX_TEMP_MODE	MSB_UNSIGNED_INTEGER	1		"SAX Temperature Mode. 0 = Off, 1 = On, 2 = Software control."	XRS_CDR
SC_ANGLE	IEEE_REAL	8	Degree	"+Z angle to Mercury surface, smoothed. -1 means it cannot be calculated."	XRS_CDR
SC_POSITION_X	IEEE_REAL	4		"Position of spacecraft in J2000 frame."	XRS_CDR
SC_POSITION_Y	IEEE_REAL	4		"Position of spacecraft in J2000 frame."	XRS_CDR
SC_POSITION_Z	IEEE_REAL	4		"Position of spacecraft in J2000 frame."	XRS_CDR
SC_RANGE	IEEE_REAL	8	Kilometer	"+Z range to Mercury surface, smoothed. -1 means it cannot be calculated."	XRS_CDR
SCALT	IEEE_REAL	4	Kilometer	"Hermocentric altitude, in kilometers, of the sub-spacecraft point in Mercury-fixed rotating frame at the middle of the pixel."	XRS_CDR
SCIENCE_RECORD_VERSION	MSB_UNSIGNED_INTEGER	1		"Version of science packet format."	XRS_CDR
SENSOR_CONFIG_CHANGED	MSB_UNSIGNED_INTEGER	1		"Flag showing whether sensor configuration has changed. =0 no change, =1 change."	XRS_CDR
SOFTWARE_SUB_VERSION	MSB_UNSIGNED_INTEGER	1		"Sub-version of flight software."	XRS_CDR
SOLAR_DETECTOR_I	IEEE_REAL	8		"Solar detector current, smoothed."	XRS_CDR
SOLAR_DETECTOR_TEMP	IEEE_REAL	8	Degree(C)	"Solar detector temperature, smoothed."	XRS_CDR
SOLAR_FLARE_DETECTED	MSB_UNSIGNED_INTEGER	1		"Solar flare detection flag. =0 no solar flare detected, =1 flare detected."	XRS_CDR
SOLAR_MONITOR_ANALYZED_RATE	MSB_UNSIGNED_INTEGER	4		"Number of events that get fully processed. The number of counts in a solar monitor spectrum ."	XRS_CDR
SOLAR_MONITOR_HIGH_E_RATE	MSB_UNSIGNED_INTEGER	4		"Solar monitor high energy rate per integration period. All counts above the top channel."	XRS_CDR
SOLAR_MONITOR_LOSS	MSB_UNSIGNED_INTEGER	1		"The loss rate from the electronics to the software. It’s the fraction of events that overflow the FIFO and are lost. It does not include front-end losses."	XRS_CDR
SOLAR_MONITOR_PILEUP_RATE	MSB_UNSIGNED_INTEGER	4		"Number of events that suffer from pileup."	XRS_CDR
SOLAR_MONITOR_RATE	MSB_UNSIGNED_INTEGER	4		"Solar monitor detector rate per integration period."	XRS_CDR
SOLAR_MONITOR_SPECT_SHIFT	MSB_UNSIGNED_INTEGER	2		"The divisor (bit shift) for the Solar Monitor spectrum. When any channel in the solar monitor spectrum exceeds 65535, the spectrum is shifted to the right, throwing out the least significant bits, keeping the 16 most significant bits."	XRS_CDR
SOLAR_MON_SPECTRUM_23_253	MSB_UNSIGNED_INTEGER	462		"Solar monitor spectra channels (23-253)."	XRS_CDR
SOLAR_MONITOR_VALID_RATE	MSB_UNSIGNED_INTEGER	4		"Solar monitor valid rate per integration period."	XRS_CDR
SOLAR_STABILITY	MSB_UNSIGNED_INTEGER	20		"A 10 element array of solar monitor detector rate measurements. The integration period is divided into 10 equal segments with an accumulated rate (per second) for each. Valid data for this column is only obtained by the instrument if solar flare handling is enabled at the start of the integration and reporting period. Values are set to a default of 999 if solar flare handling was not enabled."	XRS_CDR
SPARE	MSB_UNSIGNED_INTEGER	1		"Spare column for possible future use."	XRS_CDR
SPARE_DAC_1	MSB_UNSIGNED_INTEGER	1		"Spare column (DAC 1)."	XRS_CDR
SPARE_DAC_2	MSB_UNSIGNED_INTEGER	1		"Spare column (DAC 2)."	XRS_CDR
STATUS_INTERVAL	MSB_UNSIGNED_INTEGER	2		"Time period (in seconds) between status packets."	XRS_CDR
SUB_SCPOS_MERCURY_X	IEEE_REAL	4		"Sub spacecraft vector x component in Mercury fixed coordinates at the middle of the pixel."	XRS_CDR
SUB_SCPOS_MERCURY_Y	IEEE_REAL	4		"Sub spacecraft vector y component in Mercury fixed coordinates at the middle of the pixel."	XRS_CDR
SUB_SCPOS_MERCURY_Z	IEEE_REAL	4		"Sub spacecraft vector z component in Mercury fixed coordinates at the middle of the pixel."	XRS_CDR
SUN_DISTANCE	IEEE_REAL	4	Kilometer	"Sun Position vector magnitude."	XRS_CDR
SUN_POSITION_X	IEEE_REAL	4		"Position of the Sun in Mercury fixed coord. System."	XRS_CDR
SUN_POSITION_Y	IEEE_REAL	4		"Position of the Sun in Mercury fixed coord. System."	XRS_CDR
SUN_POSITION_Z	IEEE_REAL	4		"Position of the Sun in Mercury fixed coord. system."	XRS_CDR
SW_VERSION	MSB_UNSIGNED_INTEGER	1		"Software version number."	XRS_CDR
TEC_CURRENT_SETTING	MSB_UNSIGNED_INTEGER	1		"TEC current setting."	XRS_CDR
TEC_I	IEEE_REAL	8	Microamp	"TEC current, smoothed."	XRS_CDR
TEC_LOSS_OF_CONTROL	MSB_UNSIGNED_INTEGER	1		"TEC loss of control flag. =0 no loss of control, =1 loss of control."	XRS_CDR
TOTAL_EFF_SOLID_ANGLE	IEEE_REAL	4	Steradian	"Overall solid angle in the footprint contributing to the spectrum (lit by the sun and visible from the spacecraft) and weighted by the response function of the collimator, relatively the instrument full field of view."	XRS_CDR
TOTAL_ILLUMINATED_AREA	IEEE_REAL	4	Kilometer**2	"Total area in the footprint contributing to the spectrum (lit by the sun and visible from the spacecraft)."	XRS_CDR
TOTAL_VISIBLE_AREA	IEEE_REAL	4	Kilometer**2	"Total area in the footprint visible from the spacecraft."	XRS_CDR
UTC	CHARACTER	23		"MET converted to UTC, stored as: yyyy-mm-ddThh:mm:ss.sss."	XRS_CDR

7.6 APPENDIX: XRS PDS FMT File: XRS_CDR.FMT

OBJECT = COLUMN

NAME = MET

COLUMN_NUMBER = 1

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 1

UNIT = Seconds

DESCRIPTION = "Time tag in seconds, 0 = MESSENGER launch."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ORBIT_NUMBER

COLUMN_NUMBER = 2

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 5

DESCRIPTION = "Orbit number is a unique identifier for a

given orbit of the MESSENGER spacecraft around Mercury.

Orbit number is defined as starting at apoherm and is

calculated using the MET value and the appropriate SPICE

kernels. Orbit numbering does not start until MESSENGER

performs the Mercury orbit insertion. Until that time the

value for orbit number is 0."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = STATUS_INTERVAL

COLUMN_NUMBER = 3

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 9

UNIT = Seconds

DESCRIPTION = "Time period (in seconds) between status packets."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SC_RANGE

COLUMN_NUMBER = 4

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 11

UNIT = Kilometers

DESCRIPTION = "+Z range to Mercury surface, smoothed.

-1 means it cannot be calculated."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SC_ANGLE

COLUMN_NUMBER = 5

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 19

UNIT = Degrees

DESCRIPTION = "+Z angle to Mercury surface, smoothed.

-1 means it cannot be calculated."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DATA_QUALITY

COLUMN_NUMBER = 6

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 27

DESCRIPTION = "Integer representation of a 32-bit array. Each bit

represents a data quality flag. Currently only the least

significant bit is being used. Other bit positions will be

designated during the course of the mission as more data quality

parameters are identified by the instrument team. =1, the actual

data length in bytes does not match the reported length. =0,

actual data length in bytes matches reported length."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SW_VERSION

COLUMN_NUMBER = 7

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 31

DESCRIPTION = "Software version number."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ALARM_ID

COLUMN_NUMBER = 8

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 32

DESCRIPTION = "The identifier for the last XRS alarm, 0 for no

alarm and non-zero for a long list of various parameters out

of range."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ALARM_TYPE

COLUMN_NUMBER = 9

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 33

DESCRIPTION = "Latest alarm type. =0 persistent, =1 transient."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ALARM_COUNT

COLUMN_NUMBER = 10

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 34

DESCRIPTION = "Count of number of alarms."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = CMD_EXECUTED

COLUMN_NUMBER = 11

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 35

DESCRIPTION = "Number of commands executed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = CMD_REJECTED

COLUMN_NUMBER = 12

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 36

DESCRIPTION = "Number of commands rejected."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MONITOR_RESPONSE

COLUMN_NUMBER = 13

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 37

DESCRIPTION = "Monitor response. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MEM_WRITE_ENABLE

COLUMN_NUMBER = 14

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 38

DESCRIPTION = "Memory write enable. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MACRO_LEARN_MODE

COLUMN_NUMBER = 15

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 39

DESCRIPTION = "Macro learn mode. =0 not learning, =1 learning."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SPARE

COLUMN_NUMBER = 16

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 40

DESCRIPTION = "Spare column for possible future use."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SCIENCE_RECORD_VERSION

COLUMN_NUMBER = 17

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 41

DESCRIPTION = "Version of science packet format."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MACRO_ID

COLUMN_NUMBER = 18

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 42

DESCRIPTION = "ID of most recent macro executed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MACROS_REJECTED

COLUMN_NUMBER = 19

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 43

DESCRIPTION = "Number of macro commands rejected."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MACROS_EXECUTED

COLUMN_NUMBER = 20

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 44

DESCRIPTION = "Number of macro commands executed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MACRO_BLOCKS

COLUMN_NUMBER = 21

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 45

DESCRIPTION = "Number of macro blocks free."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SAFING_LEVEL

COLUMN_NUMBER = 22

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 47

DESCRIPTION = "The safing level set for the GPC1-MG detector.

=0 level zero or nominal level safing; the software will

monitor the planetary detector for the conditions which

necessitate a higher level of safing. =1 level 1 safing; the

HVPS voltage level for the affected sensor is ramped

down to 0 at a rate of 100 V/sec. =2 level 2 safing; the

software turns off analog power to the affected sensor and

turns off the associated HVPS. No further attempts are made

to restore the level-two-safed sensor to nominal safing. The

software waits for ground command to reset the affected HVPS

voltage levels."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SAFING_RETRY

COLUMN_NUMBER = 23

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 48

DESCRIPTION = "The max number of retry attempts to reset the

GPC1-MG detector to level 0 safing."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SAFING_LEVEL

COLUMN_NUMBER = 24

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 49

DESCRIPTION = "The safing level set for the GPC2-AL detector.

=0 level zero or nominal level safing; the software will

monitor the planetary detector for the conditions which

necessitate a higher level of safing. =1 level 1 safing; the

HVPS voltage level for the affected sensor is ramped

down to 0 at a rate of 100 V/sec. =2 level 2 safing; the

software turns off analog power to the affected sensor and

turns off the associated HVPS. No further attempts are made

to restore the level-two-safed sensor to nominal safing.

The software waits for ground command to reset the affected

HVPS voltage levels."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SAFING_RETRY

COLUMN_NUMBER = 25

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 50

DESCRIPTION = "The max number of retry attempts to reset the

GPC2-AL detector to level 0 safing."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SAFING_LEVEL

COLUMN_NUMBER = 26

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 51

DESCRIPTION = "The safing level set for the GPC3-UNfiltered (UN)

detector. =0 level zero or nominal level safing; the software

will monitor the planetary detector for the conditions which

necessitate a higher level of safing. =1 level 1 safing; the

HVPS voltage level for the affected sensor is ramped down to

0 at a rate of 100 V/sec. =2 level 2 safing; the software turns

off analog power to the affected sensor and turns off the

associated HVPS. No further attempts are made to restore the

level-two-safed sensor to nominal safing. The software waits

for ground command to reset the affected HVPS voltage levels."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SAFING_RETRY

COLUMN_NUMBER = 27

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 52

DESCRIPTION = "The max number of retry attempts to reset the

GPC3-UN detector to level 0 safing."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DISCARDED_PACKET_COUNTER

COLUMN_NUMBER = 28

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 53

DESCRIPTION = "Number of calls to send-pkt that resulted in a return

value of false."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TEC_LOSS_OF_CONTROL

COLUMN_NUMBER = 29

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 54

DESCRIPTION = "TEC loss of control flag. =0 no loss of control,

=1 loss of control."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_FLARE_DETECTED

COLUMN_NUMBER = 30

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 55

DESCRIPTION = "Solar flare detection flag. =0 no solar flare detected,

=1 flare detected."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = FLARE_HANDLING_ENABLED

COLUMN_NUMBER = 31

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 56

DESCRIPTION = "Solar flare handling enabled flag, software checks

this value upon detection of a solar flare. =0 do not handle solar

flare detection. =1 continue algorithm for handling solar flare

detection (see SOLAR_FLARE_ENACT)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = FLARE_HANDLING_ENACTED

COLUMN_NUMBER = 32

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 57

DESCRIPTION = "Solar flare handling enacted flag. Allows software

to determine if solar flare handling has already been enacted or

whether this is a new detection of a solar flare. Only checked if

solar flare handling has been enabled (see previous field).

=0 the software sets it to true, starts the sf-time-enactable-left

counter out at sf-max-time-enactable, sets a flag telling the 1Hz

process to end the current integration and reporting period

immediately, and returns control to the 1Hz process. =1 , the

software decrements the sf-time-enactable-left counter and checks

its value. If sf-time-enactable-left is still greater than 0, the

algorithm does nothing further. If sf-time-enactable-left has reached

0, the algorithm starts the sf-timeout-left counter out at

sf-timeout-period and sets the sf-handling-enacted-now flag to false."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SENSOR_CONFIG_CHANGED

COLUMN_NUMBER = 33

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 58

DESCRIPTION = "Flag showing whether sensor configuration has

changed. =0 no change, =1 change."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_PLUS_5V

COLUMN_NUMBER = 34

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 59

UNIT = Volts

DESCRIPTION = "LVPS +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_MINUS_5V

COLUMN_NUMBER = 35

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 67

UNIT = Volts

DESCRIPTION = "LVPS -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_PLUS_12V

COLUMN_NUMBER = 36

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 75

DESCRIPTION = "LVPS +12 volt monitor, smoothed."

UNIT = Volts

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_MINUS_12V

COLUMN_NUMBER = 37

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 83

UNIT = Volts

DESCRIPTION = "LVPS -12 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_SPARE0

COLUMN_NUMBER = 38

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 91

DESCRIPTION = "Spare unused column for LVPS monitoring."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_SPARE1

COLUMN_NUMBER = 39

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 92

DESCRIPTION = "Spare unused column for LVPS monitoring."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_SPARE2

COLUMN_NUMBER = 40

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 93

DESCRIPTION = "Spare unused column for LVPS monitoring."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOFTWARE_SUB_VERSION

COLUMN_NUMBER = 41

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 94

DESCRIPTION = "Sub-version of flight software."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = I2C_BUS_ERROR_COUNT

COLUMN_NUMBER = 42

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 95

DESCRIPTION = "I2C bus error count."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_PLUS_5_I

COLUMN_NUMBER = 43

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 96

UNIT = MicroAmps

DESCRIPTION = "LVPS +5V current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_MINUS_5_I

COLUMN_NUMBER = 44

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 104

UNIT = MicroAmps

DESCRIPTION = "LVPS -5V current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_PLUS_12_I

COLUMN_NUMBER = 45

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 112

UNIT = MicroAmps

DESCRIPTION = "LVPS +12V current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_MINUS_12_I

COLUMN_NUMBER = 46

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 120

UNIT = MicroAmps

DESCRIPTION = "LVPS -12V current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_TEMP

COLUMN_NUMBER = 47

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 128

UNIT = Degrees(C)

DESCRIPTION = "LVPS temperature, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_PRIMARY_I

COLUMN_NUMBER = 48

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 136

UNIT = MicroAmps

DESCRIPTION = "LVPS primary current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LVPS_SWITCHED_PRIMARY_I

COLUMN_NUMBER = 49

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 144

UNIT = MicroAmps

DESCRIPTION = "LVPS switched primary current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_PLUS_5V

COLUMN_NUMBER = 50

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 152

UNIT = Volts

DESCRIPTION = "GPC1-MG +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_PLUS_5V

COLUMN_NUMBER = 51

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 160

UNIT = Volts

DESCRIPTION = "GPC2-AL +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_PLUS_5V

COLUMN_NUMBER = 52

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 168

UNIT = Volts

DESCRIPTION = "GPC3-UN +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SAX_PLUS_5V

COLUMN_NUMBER = 53

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 176

UNIT = Volts

DESCRIPTION = "SAX +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ANALOG_PLUS_5V

COLUMN_NUMBER = 54

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 184

UNIT = Volts

DESCRIPTION = "Analog +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DIGITAL_PLUS_5V

COLUMN_NUMBER = 55

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 192

UNIT = Volts

DESCRIPTION = "Digital +5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_MINUS_5V

COLUMN_NUMBER = 56

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 200

UNIT = Volts

DESCRIPTION = "GPC1-MG -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_MINUS_5V

COLUMN_NUMBER = 57

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 208

UNIT = Volts

DESCRIPTION = "GPC2-AL -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_MINUS_5V

COLUMN_NUMBER = 58

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 216

UNIT = Volts

DESCRIPTION = "GPC3-UN -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SAX_MINUS_5V

COLUMN_NUMBER = 59

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 224

UNIT = Volts

DESCRIPTION = "SAX -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ANALOG_MINUS_5V

COLUMN_NUMBER = 60

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 232

UNIT = Volts

DESCRIPTION = "Analog -5 volt monitor, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TEC_I

COLUMN_NUMBER = 61

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 240

UNIT = MicroAmps

DESCRIPTION = "TEC current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MXU_TEMP

COLUMN_NUMBER = 62

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 248

UNIT = Degrees(C)

DESCRIPTION = "MXU temperature, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_DETECTOR_TEMP

COLUMN_NUMBER = 63

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 256

UNIT = Degrees(C)

DESCRIPTION = "Solar detector temperature, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SAX_TEMP

COLUMN_NUMBER = 64

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 264

UNIT = Degrees(C)

DESCRIPTION = "SAX temperature, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_DETECTOR_I

COLUMN_NUMBER = 65

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 272

UNIT = Pico-Amps

DESCRIPTION = "Solar detector current, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VOLTAGE_STEPPING

COLUMN_NUMBER = 66

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 280

DESCRIPTION = "Indicates whether the GPC1-MG detector's high

voltage state is seeking. See the MESSENGER XRS Software

Specification document for an explanation of the seeking

state. =0 no, =1 yes."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VOLTAGE

COLUMN_NUMBER = 67

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 281

UNIT = Volts

DESCRIPTION = "GPC1-MG voltage measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VOLTAGE_STEPPING

COLUMN_NUMBER = 68

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 289

DESCRIPTION = "Indicates whether the GPC2-AL detector's high

voltage state is seeking. See the MESSENGER XRS Software

Specification document for an explanation of the seeking

state. =0 no, =1 yes."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VOLTAGE

COLUMN_NUMBER = 69

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 290

UNIT = Volts

DESCRIPTION = "GPC2-AL voltage measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VOLTAGE_STEPPING

COLUMN_NUMBER = 70

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 298

DESCRIPTION = "Indicates whether the GPC3-UN detector's high

voltage state is seeking. See the MESSENGER XRS Software

Specification document for an explanation of the seeking

state. =0 no, =1 yes."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VOLTAGE

COLUMN_NUMBER = 71

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 299

UNIT = Volts

DESCRIPTION = "GPC3-UN voltage measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BIAS_SUPPLY_VOLT_STEPPING

COLUMN_NUMBER = 72

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 307

DESCRIPTION = "Indicates whether the Bias detector's high

voltage state is seeking. See the MESSENGER XRS Software

Specification document for an explanation of the seeking

state. =0 no, =1 yes."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BIAS_VOLTAGE

COLUMN_NUMBER = 73

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 308

UNIT = Volts

DESCRIPTION = "Bias voltage measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SUPPLY_TEMP

COLUMN_NUMBER = 74

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 316

UNIT = Degrees(C)

DESCRIPTION = "GPC1-MG supply temperature measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SUPPLY_TEMP

COLUMN_NUMBER = 75

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 324

UNIT = Degrees(C)

DESCRIPTION = "GPC2-AL supply temperature measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SUPPLY_TEMP

COLUMN_NUMBER = 76

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 332

UNIT = Degrees(C)

DESCRIPTION = "GPC3-UN supply temperature measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BIAS_SUPPLY_TEMP

COLUMN_NUMBER = 77

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 340

UNIT = Degrees(C)

DESCRIPTION = "Bias supply temperature measurement, smoothed."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ACTUAL_INTEGRATION_TIME

COLUMN_NUMBER = 78

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 348

UNIT = Seconds

DESCRIPTION = "Actual integration period in seconds."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ACTUAL_REPORTING_TIME

COLUMN_NUMBER = 79

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 352

UNIT = Seconds

DESCRIPTION = "Actual reporting time in seconds."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_POWER_ANALOG

COLUMN_NUMBER = 80

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 356

DESCRIPTION = "GPC1-MG analog power setting. =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_POWER_HVPS

COLUMN_NUMBER = 81

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 357

DESCRIPTION = "GPC1-MG HVPS power setting, =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VOLTAGE_SETTING

COLUMN_NUMBER = 82

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 358

DESCRIPTION = "GPC1-MG voltage setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_POWER_ANALOG

COLUMN_NUMBER = 83

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 360

DESCRIPTION = "GPC2-AL analog power setting, =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_POWER_HVPS

COLUMN_NUMBER = 84

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 361

DESCRIPTION = "GPC2-AL HVPS power setting, =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VOLTAGE_SETTING

COLUMN_NUMBER = 85

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 362

DESCRIPTION = "GPC2-AL voltage setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_POWER_ANALOG

COLUMN_NUMBER = 86

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 364

DESCRIPTION = "GPC3-UN analog power setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_POWER_HVPS

COLUMN_NUMBER = 87

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 365

DESCRIPTION = "GPC3-UN HVPS power setting, =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VOLTAGE_SETTING

COLUMN_NUMBER = 88

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 366

DESCRIPTION = "GPC3-UN voltage setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_POWER_ANALOG

COLUMN_NUMBER = 89

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 368

DESCRIPTION = "PIN analog power setting. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_TEC_ENABLE

COLUMN_NUMBER = 90

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 369

DESCRIPTION = "PIN TEC enable, =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_TEC_MODE

COLUMN_NUMBER = 91

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 370

DESCRIPTION = "PIN TEC mode, =0 cool, =1 heat."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_POWER_BIAS

COLUMN_NUMBER = 92

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 371

DESCRIPTION = "PIN power bias =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BIAS_VOLTAGE_SETTING

COLUMN_NUMBER = 93

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 372

DESCRIPTION = "Bias voltage setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_LOW_LEVEL_DISC

COLUMN_NUMBER = 94

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 374

DESCRIPTION = "GPC1-MG low level discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_TIME_DISC_1

COLUMN_NUMBER = 95

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 375

DESCRIPTION = "GPC1-MG rise time discriminator 1."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_TIME_DISC_2

COLUMN_NUMBER = 96

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 376

DESCRIPTION = "GPC1-MG rise time discriminator 2."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VETO_DISC

COLUMN_NUMBER = 97

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 377

DESCRIPTION = "GPC1-MG veto discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_LOW_LEVEL_DISC

COLUMN_NUMBER = 98

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 378

DESCRIPTION = "GPC2-AL low level discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_TIME_DISC_1

COLUMN_NUMBER = 99

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 379

DESCRIPTION = "GPC2-AL rise time discriminator 1."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_TIME_DISC_2

COLUMN_NUMBER = 100

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 380

DESCRIPTION = "GPC2-AL rise time discriminator 2."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VETO_DISC

COLUMN_NUMBER = 101

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 381

DESCRIPTION = "GPC2-AL veto discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_LOW_LEVEL_DISC

COLUMN_NUMBER = 102

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 382

DESCRIPTION = "GPC3-UN low level discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_TIME_DISC_1

COLUMN_NUMBER = 103

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 383

DESCRIPTION = "GPC3-UN rise time discriminator 1."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_TIME_DISC_2

COLUMN_NUMBER = 104

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 384

DESCRIPTION = "GPC3-UN rise time discriminator 2."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VETO_DISC

COLUMN_NUMBER = 105

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 385

DESCRIPTION = "GPC3-UN veto discriminator."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_LOW_LEVEL_DISC

COLUMN_NUMBER = 106

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 386

DESCRIPTION = "PIN low level discriminator (energy threshold)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TEC_CURRENT_SETTING

COLUMN_NUMBER = 107

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 387

DESCRIPTION = "TEC current setting."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SPARE_DAC_1

COLUMN_NUMBER = 108

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 388

DESCRIPTION = "Spare column (DAC 1)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SPARE_DAC_2

COLUMN_NUMBER = 109

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 389

DESCRIPTION = "Spare column (DAC 2)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_PILEUP

COLUMN_NUMBER = 110

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 390

DESCRIPTION = "RISE PILEUP criterion to determine valid event for

GPC2_AL detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_TIME

COLUMN_NUMBER = 111

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 391

DESCRIPTION = "RISE TIME criterion to determine valid event for

GPC2_AL detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_PILEUP_ENABLE

COLUMN_NUMBER = 112

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 392

DESCRIPTION = "PILEUP_ENABLE criterion to determine valid event for

GPC2_AL detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VETO_ENABLE

COLUMN_NUMBER = 113

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 393

DESCRIPTION = "VETO_ENABLE criterion to determine valid event for

GPC2_AL detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_ENABLE

COLUMN_NUMBER = 114

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 394

DESCRIPTION = "ENABLE criterion to determine valid event for

GPC2_AL detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_PILEUP

COLUMN_NUMBER = 115

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 395

DESCRIPTION = "RISE PILEUP criterion to determine valid event for

GPC1_MG detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_TIME

COLUMN_NUMBER = 116

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 396

DESCRIPTION = "RISE TIME criterion to determine valid event for

GPC1_MG detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_PILEUP_ENABLE

COLUMN_NUMBER = 117

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 397

DESCRIPTION = "PILEUP ENABLE criterion to determine valid event

for GPC1_MG detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VETO_ENABLE

COLUMN_NUMBER = 118

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 398

DESCRIPTION = "VETO ENABLE criterion to determine valid event

for GPC1_MG detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_ENABLE

COLUMN_NUMBER = 119

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 399

DESCRIPTION = "ENABLE criterion to determine valid event for

GPC1_MG detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DEBUG_COUNTERS

COLUMN_NUMBER = 120

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 400

DESCRIPTION = "Diagnostic for planetary sensor. =0 disabled,

=1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_PILEUP_ENABLE

COLUMN_NUMBER = 121

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 401

DESCRIPTION = "PIN PILEUP criterion to determine valid event

for PIN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PIN_ENABLE

COLUMN_NUMBER = 122

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 402

DESCRIPTION = "ENABLE criterion to determine valid event for

PIN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_PILEUP

COLUMN_NUMBER = 123

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 403

DESCRIPTION = "RISE PILEUP criterion to determine valid event

for GPC3_UN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_TIME

COLUMN_NUMBER = 124

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 404

DESCRIPTION = "RISE TIME criterion to determine valid event for

GPC3_UN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_PILEUP_ENABLE

COLUMN_NUMBER = 125

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 405

DESCRIPTION = "PILEUP ENABLE criterion to determine valid event

for GPC3_UN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VETO_ENABLE

COLUMN_NUMBER = 126

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 406

DESCRIPTION = "VETO ENABLE criterion to determine valid event

for GPC3_UN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_ENABLE

COLUMN_NUMBER = 127

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 407

DESCRIPTION = "ENABLE criterion to determine valid event for

GPC3_UN detector. =0 disabled, =1 enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_RATE

COLUMN_NUMBER = 128

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 408

DESCRIPTION = "Solar monitor detector rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_PILEUP_RATE

COLUMN_NUMBER = 129

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 412

DESCRIPTION = "Number of events that suffer from pileup."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_VALID_RATE

COLUMN_NUMBER = 130

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 416

DESCRIPTION = "Solar monitor valid rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_ANALYZED_RATE

COLUMN_NUMBER = 131

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 420

DESCRIPTION = "Number of events that get fully processed.

The number of counts in a solar monitor spectrum ."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_HIGH_E_RATE

COLUMN_NUMBER = 132

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 424

DESCRIPTION = "Solar monitor high energy rate per integration

period. All counts above the top channel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_LOSS

COLUMN_NUMBER = 133

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 428

DESCRIPTION = "The loss rate from the electronics to the software.

It’s the fraction of events that overflow the FIFO and are lost.

It does not include front-end losses."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_CENTER_ANODE_RATE

COLUMN_NUMBER = 134

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 429

DESCRIPTION = "GPC1-MG center anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VETO_ANODE_RATE

COLUMN_NUMBER = 135

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 433

DESCRIPTION = "GPC1-MG veto anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VETO_RATE

COLUMN_NUMBER = 136

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 437

DESCRIPTION = "GPC1-MG veto rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_PILEUP_RATE

COLUMN_NUMBER = 137

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 441

DESCRIPTION = "GPC1-MG pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_PILEUP_RATE

COLUMN_NUMBER = 138

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 445

DESCRIPTION = "GPC1-MG rise pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VALID_RATE

COLUMN_NUMBER = 139

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 449

DESCRIPTION = "GPC1-MG valid rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_ANALYZED_EVENT_RATE

COLUMN_NUMBER = 140

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 453

DESCRIPTION = "GPC1-MG analyzed event rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_RISE_TIME_REJECT

COLUMN_NUMBER = 141

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 457

DESCRIPTION = "GPC1-MG rise time reject rate per integration

period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_HIGH_ENERGY_RATE

COLUMN_NUMBER = 142

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 461

DESCRIPTION = "GPC1-MG high energy rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SPARE_RATE_1

COLUMN_NUMBER = 143

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 465

DESCRIPTION = "Spare column for GPC1-MG rates per integration

period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SPARE_RATE_2

COLUMN_NUMBER = 144

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 469

DESCRIPTION = "Spare column for GPC1-MG rates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_LOSS_PERCENTAGE

COLUMN_NUMBER = 145

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 473

DESCRIPTION = "GPC1-MG loss percentage."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_CENTER_ANODE_RATE

COLUMN_NUMBER = 146

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 474

DESCRIPTION = "GPC2-AL center anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VETO_ANODE_RATE

COLUMN_NUMBER = 147

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 478

DESCRIPTION = "GPC2-AL veto anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VETO_RATE

COLUMN_NUMBER = 148

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 482

DESCRIPTION = "GPC2-AL veto rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_PILEUP_RATE

COLUMN_NUMBER = 149

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 486

DESCRIPTION = "GPC2-AL pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_PILEUP_RATE

COLUMN_NUMBER = 150

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 490

DESCRIPTION = "GPC2-AL rise pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VALID_RATE

COLUMN_NUMBER = 151

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 494

DESCRIPTION = "GPC2-AL valid rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_ANALYZED_EVENT_RATE

COLUMN_NUMBER = 152

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 498

DESCRIPTION = "GPC2-AL analyzed event rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_RISE_TIME_REJECT

COLUMN_NUMBER = 153

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 502

DESCRIPTION = "GPC2-AL rise time reject rate per integration

period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_HIGH_ENERGY_RATE

COLUMN_NUMBER = 154

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 506

DESCRIPTION = "GPC2-AL high energy rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SPARE_RATE_1

COLUMN_NUMBER = 155

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 510

DESCRIPTION = "GPC2-AL spare rates column."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SPARE_RATE_2

COLUMN_NUMBER = 156

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 514

DESCRIPTION = "GPC2-AL spare rates column."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_LOSS_PERCENTAGE

COLUMN_NUMBER = 157

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 518

DESCRIPTION = "GPC2-AL loss percentage."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_CENTER_ANODE_RATE

COLUMN_NUMBER = 158

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 519

DESCRIPTION = "GPC3-UN center anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VETO_ANODE_RATE

COLUMN_NUMBER = 159

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 523

DESCRIPTION = "GPC3-UN veto anode rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VETO_RATE

COLUMN_NUMBER = 160

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 527

DESCRIPTION = "GPC3-UN veto rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_PILEUP_RATE

COLUMN_NUMBER = 161

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 531

DESCRIPTION = "GPC3-UN pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_PILEUP_RATE

COLUMN_NUMBER = 162

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 535

DESCRIPTION = "GPC3-UN rise pileup rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VALID_RATE

COLUMN_NUMBER = 163

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 539

DESCRIPTION = "GPC3-UN valid rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_ANALYZED_EVENT_RATE

COLUMN_NUMBER = 164

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 543

DESCRIPTION = "GPC3-UN analyzed event rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_RISE_TIME_REJECT

COLUMN_NUMBER = 165

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 547

DESCRIPTION = "GPC3-UN rise time reject rate per integration

period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_HIGH_ENERGY_RATE

COLUMN_NUMBER = 166

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 551

DESCRIPTION = "GPC3-UN high energy rate per integration period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SPARE_RATE_1

COLUMN_NUMBER = 167

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 555

DESCRIPTION = "Spare column for GPC3-UN rates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SPARE_RATE_2

COLUMN_NUMBER = 168

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 559

DESCRIPTION = "Spare column for GPC3-UN rates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_LOSS_PERCENTAGE

COLUMN_NUMBER = 169

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 563

DESCRIPTION = "GPC3-UN loss percentage."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_STABILITY

COLUMN_NUMBER = 170

BYTES = 20

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 564

ITEMS = 10

ITEM_BYTES = 2

DESCRIPTION = "A 10 element array of solar monitor detector rate

measurements. The integration period is divided into 10 equal

segments with an accumulated rate (per second) for each. Valid

data for this column is only obtained by the instrument if solar

flare handling is enabled at the start of the integration and

reporting period. Values are set to a default of 999 if solar

flare handling was not enabled."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MONITOR_SPECT_SHIFT

COLUMN_NUMBER = 171

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 584

DESCRIPTION = "The divisor (bit shift) for the Solar Monitor

spectrum. When any channel in the solar monitor spectrum exceeds

65535, the spectrum is shifted to the right, throwing out the

least significant bits, keeping the 16 most significant bits."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SOLAR_MON_SPECTRUM_23_253

COLUMN_NUMBER = 172

BYTES = 462

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 586

ITEMS = 231

ITEM_BYTES = 2

DESCRIPTION = "Solar monitor spectra channels (23-253)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_SPECTRUM_10_253

COLUMN_NUMBER = 173

BYTES = 488

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 1048

ITEMS = 244

ITEM_BYTES = 2

DESCRIPTION = "GPC1-MG spectra channels (10-253)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_SPECTRUM_10_253

COLUMN_NUMBER = 174

BYTES = 488

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 1536

ITEMS = 244

ITEM_BYTES = 2

DESCRIPTION = "GPC2-AL spectra channels (10-253)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_SPECTRUM_10_253

COLUMN_NUMBER = 175

BYTES = 488

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 2024

ITEMS = 244

ITEM_BYTES = 2

DESCRIPTION = "GPC3-UN spectra channels (10-253)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = UTC

COLUMN_NUMBER = 176

BYTES = 23

DATA_TYPE = CHARACTER

START_BYTE = 2512

DESCRIPTION = "MET converted to UTC, stored as:

yyyy-mm-ddThh:mm:ss.sss."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LOCAL_HOUR

COLUMN_NUMBER = 177

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 2535

UNIT = Hours

DESCRIPTION = "Local Sun hour at the sub-spacecraft point."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LOCAL_MINUTE

COLUMN_NUMBER = 178

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 2536

UNIT = Minutes

DESCRIPTION = "Local Sun minute at the sub-spacecraft point."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MERCURY_SOL

COLUMN_NUMBER = 179

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 2537

UNIT = Degrees

DESCRIPTION = "Longitude of the Sun at 0 hours UT on the date

of the record. Taken from the Association of Lunar and Planetary

Observers Ephemeris for Physical Observation of Mercury."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = PHASE_ANGLE

COLUMN_NUMBER = 180

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2545

UNIT = Degrees

DESCRIPTION = "Phase angle (between direction from the sun to the

surface and direction from the surface to the spacecraft)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = AVG_SC_DISTANCE

COLUMN_NUMBER = 181

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2549

UNIT = Kilometers

DESCRIPTION = "Average distance of the planet from the Spacecraft."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ANGLE_SUN_SOLAR_MONITOR

COLUMN_NUMBER = 182

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2553

UNIT = Degrees

DESCRIPTION = "Angle between the Sun and the solar monitor."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUN_DISTANCE

COLUMN_NUMBER = 183

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2557

UNIT = Kilometers

DESCRIPTION = "Sun Position vector magnitude."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INTERSECTION

COLUMN_NUMBER = 184

BYTES = 1

DATA_TYPE = BOOLEAN

START_BYTE = 2561

DESCRIPTION = "True if the pointing vector intersects Mercury."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = POINTING

COLUMN_NUMBER = 185

BYTES = 1

DATA_TYPE = BOOLEAN

START_BYTE = 2562

DESCRIPTION = "True if pointing data was available."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = HERMEOCENTRIC_LATITUDE

COLUMN_NUMBER = 186

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 2563

UNIT = Degrees

DESCRIPTION = "Sub spacecraft longitude in Mercury fixed

coordinates at the middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = HERMEOCENTRIC_LONGITUDE

COLUMN_NUMBER = 187

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 2571

UNIT = Degrees

DESCRIPTION = "Sub spacecraft longitude in Mercury fixed

coordinated at the middle of the pixel. Longitude increases

towards the East."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SCALT

COLUMN_NUMBER = 188

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2579

UNIT = Kilometers

DESCRIPTION = "Hermocentric altitude, in kilometers, of the

sub-spacecraft point in Mercury-fixed rotating frame in the

middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BS_VECTOR_X

COLUMN_NUMBER = 189

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2583

DESCRIPTION = "Boresight vector, x component in the J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BS_VECTOR_Y

COLUMN_NUMBER = 190

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2587

DESCRIPTION = "Boresight vector, y component in the J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BS_VECTOR_Z

COLUMN_NUMBER = 191

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2591

DESCRIPTION = "Boresight vector, z component in the J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_X

COLUMN_NUMBER = 192

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2595

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight x component in Mercury fixed

coordinates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_Y

COLUMN_NUMBER = 193

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2599

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight y component in Mercury fixed

coordinates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_Z

COLUMN_NUMBER = 194

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2603

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight z component in Mercury fixed

coordinates."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = EARTH_POSITION_X

COLUMN_NUMBER = 195

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2607

DESCRIPTION = "Position of the Earth (ET*) in Mercury fixed coord.

system (ET*)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = EARTH_POSITION_Y

COLUMN_NUMBER = 196

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2611

DESCRIPTION = "Position of the Earth (ET*) in Mercury fixed coord.

system (ET*)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = EARTH_POSITION_Z

COLUMN_NUMBER = 197

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2615

DESCRIPTION = "Position of the Earth (ET*) in Mercury fixed coord.

system (ET*)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SC_POSITION_X

COLUMN_NUMBER = 198

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2619

DESCRIPTION = "Position of spacecraft in J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SC_POSITION_Y

COLUMN_NUMBER = 199

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2623

DESCRIPTION = "Position of spacecraft in J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SC_POSITION_Z

COLUMN_NUMBER = 200

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2627

DESCRIPTION = "Position of spacecraft in J2000 frame."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUB_SCPOS_MERCURY_X

COLUMN_NUMBER = 201

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2631

DESCRIPTION = "Sub spacecraft vector x component in Mercury fixed

coordinates at the middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUB_SCPOS_MERCURY_Y

COLUMN_NUMBER = 202

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2635

DESCRIPTION = "Sub spacecraft vector y component in Mercury fixed

coordinates at the middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUB_SCPOS_MERCURY_Z

COLUMN_NUMBER = 203

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2639

DESCRIPTION = "Sub spacecraft vector z component in Mercury fixed

coordinates at the middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUN_POSITION_X

COLUMN_NUMBER = 204

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2643

DESCRIPTION = "Position of the Sun in Mercury fixed coord. System."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUN_POSITION_Y

COLUMN_NUMBER = 205

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2647

DESCRIPTION = "Position of the Sun in Mercury fixed coord. system."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SUN_POSITION_Z

COLUMN_NUMBER = 206

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2651

DESCRIPTION = "Position of the Sun in Mercury fixed coord. system."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DELTA_ANGLE

COLUMN_NUMBER = 207

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 2655

UNIT = Degrees

DESCRIPTION = "Difference between instrument +y direction and true

north at the middle of the pixel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = AVG_EMISSION_ANGLE

COLUMN_NUMBER = 208

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2663

UNIT = Degrees

DESCRIPTION = "Average emission angle (between normal to the surface

and direction from the surface to the spacecraft)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = AVG_INC_EMI_COS_RATIO

COLUMN_NUMBER = 209

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2667

DESCRIPTION = "Average ratio of the cosine of incidence angle to the

cosine of emission angle."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = AVG_INCIDENCE_ANGLE

COLUMN_NUMBER = 210

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2671

UNIT = Degrees

DESCRIPTION = "Average incidence angle."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = FOOTPRINT_SOLID_ANGLE

COLUMN_NUMBER = 211

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2675

UNIT = Steradians

DESCRIPTION = "Overall solid angle in the footprint contributing

to the spectrum (visible from the spacecraft), relatively the

instrument full field of view."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TOTAL_EFF_SOLID_ANGLE

COLUMN_NUMBER = 212

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2679

UNIT = Steradians

DESCRIPTION = "Overall solid angle of the footprint contributing

to the spectrum (lit by the sun and visible from the spacecraft)

and weighted by the response function of the collimator,

relatively the instrument full field of view."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TOTAL_ILLUMINATED_AREA

COLUMN_NUMBER = 213

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2683

UNIT = Kilometer**2

DESCRIPTION = "Total area of the footprint contributing to the spectrum

(lit by the sun and visible from the spacecraft)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = TOTAL_VISIBLE_AREA

COLUMN_NUMBER = 214

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2687

UNIT = Kilometer**2

DESCRIPTION = "Total area of the footprint visible from the spacecraft."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = FOV_STATUS

COLUMN_NUMBER = 215

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 2691

DESCRIPTION = "Field of view 0 equals Field of view (FOV)

is completely off the planet. 1 equals The field of view

is totally on the planet and at least part of the footprint

is lit by the sun. 2 equals The field of view is totally on

the planet and is dark. (planet darkside). 3 equals Part of

the field of view is off the planet and at least one plate is

lit by the sun. 4 equals Part of the field of view is off the

planet and is dark."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_LIVE_TIME

COLUMN_NUMBER = 216

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2692

UNIT = Seconds

DESCRIPTION = "Al filtered Xray actual integration time- the portion

of the period covered by this record in which the Al Xray sensor

was unmasked and Integrating."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VALID_CHANNEL_HI

COLUMN_NUMBER = 217

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2696

DESCRIPTION = "Al filtered X-Ray rise time high channel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_VALID_CHANNEL_LOW

COLUMN_NUMBER = 218

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2700

DESCRIPTION = "Al filtered X-Ray rise time low channel."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_REAL_GAIN

COLUMN_NUMBER = 219

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2704

UNIT = keV/Ch.

DESCRIPTION = "Measured gain of GPC2-Al detector in keV/ch."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC2_AL_REAL_ZERO

COLUMN_NUMBER = 220

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2708

UNIT = keV

DESCRIPTION = "Measured zero offset of GPC2-Al detector in keV."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_LIVE_TIME

COLUMN_NUMBER = 221

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2712

UNIT = Seconds

DESCRIPTION = "Mg filtered Xray actual integration time (sec.)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VALID_CHANNEL_HI

COLUMN_NUMBER = 222

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2716

DESCRIPTION = "Mg filtered Xray rise time valid discriminator

threshold; events with energy exceeding the threshold will be

rejected based on the rise time discrimination flag - the most

recently cmded value for this."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_VALID_CHANNEL_LOW

COLUMN_NUMBER = 223

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2720

DESCRIPTION = "Mg filtered Xray lower level discriminator

threshold; events with energy less than the threshold will be rejected

- the most recently cmded value for this threshold."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_REAL_GAIN

COLUMN_NUMBER = 224

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2724

UNIT = keV/Ch.

DESCRIPTION = "Measured gain of GPC1-Mg detector in keV/ch."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC1_MG_REAL_ZERO

COLUMN_NUMBER = 225

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2728

UNIT = keV

DESCRIPTION = "Measured zero offset of GPC1-Mg detector in keV."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_LIVE_TIME

COLUMN_NUMBER = 226

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2732

UNIT = Seconds

DESCRIPTION = "Unfiltered Xray actual integration time (sec.) - the

portion of the period covered by this record in which the

unfiltered Xray sensor was unmasked and integrating."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VALID_CHANNEL_HI

COLUMN_NUMBER = 227

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2736

DESCRIPTION = "Highest channel of the spectrum in original

(no calibration) or new (after calibration) energy scale."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_VALID_CHANNEL_LOW

COLUMN_NUMBER = 228

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2740

DESCRIPTION = "Lowest channel of the spectrum in original

(no calibration) or new (after calibration) energy scale."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_REAL_GAIN

COLUMN_NUMBER = 229

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2744

UNIT = keV/Ch.

DESCRIPTION = "Measured gain of GPC3-UN detector in keV/ch."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GPC3_UN_REAL_ZERO

COLUMN_NUMBER = 230

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2748

UNIT = keV

DESCRIPTION = "Measured zero offset of GPC3-UN detector in keV."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SAX_LIVE_TIME

COLUMN_NUMBER = 231

BYTES = 4

DATA_TYPE = IEEE_REAL

START_BYTE = 2752

UNIT = Seconds

DESCRIPTION = "Live time of the solar monitor."

END_OBJECT = COLUMN

DATE	SECTIONS CHANGED	REASON FOR CHANGE	REVISION
8/15/05	All	Draft	1.0a
9/9/05	All	Draft	1.0b
10/6/05	All	Draft	1.0c
10/11/05	All	Draft	1.0d
04/20/06	Appendix 6.4	Changes to EDR data types	1.0e
08/17/06	Appendix, XRS Data Columns	Added new data type, DATA_QUALITY_FLAG	1.0f
12/21/07	All	Draft	1.1
01/09/08	All	Draft	1.2
02/04/08	All	Draft	1.3
10/13/08	All	Draft	1.4
11/03/08	All	Draft	1.5
01/20/09	All	Draft	1.6
02/03/09	All	Draft	1.7
03/19/09	All	Draft	1.8
04/07/09	All	Draft	1.9
04/14/09	All	Draft	1.10
04/15/09	All	Added search indexes	1.11
05/07/09	All	Added reference to the MESSENGER X-Ray (XRS) EDR-to-CDR Processing document	1.12
05/20/09	All	Added UNIT attribute to column definitions in XRS_CDR.FMT	1.13
06/12/09	5.6	Modified the archive’s DATA sub-directory under the month sub-directory to be named after the day of the month not the day of the year.	1.14
11/5/09	5.2, 5.5.1, 5.6	Corrected the XRS label, added MISSION_PHASE_NAME, added software directory to archive	1.15
12/15/09	Header	Removed the draft in revision from the header	1.16
01/12/10	Appendix 7.5, 7.6	Revised wording for sc_range and sc_angle to document that -1 indicates value could not be computed	1.17
01/18/10	5.6.1	Minor modifications to the archive directory contents.	1.18
6/16/11	Document Review	Added document review information	1.19
6/16/11	Table 3, 7.6	Changed “periherm” to “apoherm” in orbit start time descriptions for orbit numbering	1.20
5/26/12	2, 4.1	Changed “Data Management and Science Analysis Plan” to “Data Management and Archiving Plan”. Referenced that plan for extended mission updates.	1.21
06/14/2013	1, 3, 4, 5, 6	Add information regarding elemental ratio maps.	1.22
10/24/2013	5.2, 5.3, Appx. 7.4,	Updated sample PDS labels, edited table per RDR peer review.	1.23
11/7/2013	4.2, 5.2, 5.4	Added description of resolution map products.	1.24
11/14/2013	5.2, 5.4	Updated sample map labels; added resolution map to naming conventions.	1.25
12/4/2013	4.2	Changed scaling of maps from specifics to references to labels, data.	1.26
12/21/15	4.2	Updated to reflect final RDR map product generation.	1.27
12/22/15	All	Editorial changes.	1.28
1/6/16	All	Additional editorial changes.	1.29
1/6/16	All	Additional editorial changes.	1.30
1/7/16	All	Final editorial changes.	1.31
8/18/16	All	Added information regarding RDR Footprint data products.	1.32
8/29/16	4.2	Additional editorial changes.	1.33
1/13/17	4.3.2, 5.5.1	Edits resulting from RDR Footprint peer review.	1.34
2/8/17	5.3	Revised sample index file label.	1.35

*_Name*	C0	C1	C2	C3	C4	C5	C6	C7	*Units*
SC_RANGE	0	30	0	0	0	0	0	0	Kilometers
SC_ANGLE	0	0.25	0	0	0	0	0	0	Degrees
LVPS_PLUS_5V	0	0.07935	0	0	0	0	0	0	Volts
LVPS_MINUS_5V	0	-0.07935	0	0	0	0	0	0	Volts
LVPS_PLUS_12V	0	0.07935	0	0	0	0	0	0	Volts
LVPS_MINUS_12V	0	-0.07935	0	0	0	0	0	0	Volts
LVPS_PLUS_5_I	0	7.808	0	0	0	0	0	0	mA
LVPS_MINUS_5_I	0	7.808	0	0	0	0	0	0	mA
LVPS_PLUS_12_I	0	7.808	0	0	0	0	0	0	mA
LVPS_MINUS_12_I	0	7.808	0	0	0	0	0	0	mA
LVPS_TEMP	-39.37	0.4227	-4.49E-05	5.08E-06	0	0	0	0	Deg C
LVPS_PRIMARY_I	0	7.808	0	0	0	0	0	0	mA
LVPS_SWITCHED_PRIMARY_I	0	7.808	0	0	0	0	0	0	mA
GPC1_MG_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
GPC2_AL_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
GPC3_UN_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
SAX_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
ANALOG_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
DIGITAL_PLUS_5V	0	0.0421	0	0	0	0	0	0	Volts
GPC1_MG_MINUS_5V	See below
GPC2_AL_MINUS_5V	See below
GPC3_UN_MINUS_5V	See below
SAX_MINUS_5V	See below
ANALOG_MINUS_5V	-12.1	0.05732	0	0	0	0	0	0	Volts
TEC_I	0	2.34	0	0	0	0	0	0	mA
MXU_TEMP	See below
SOLAR_DETECTOR_TEMP	See below
SAX_TEMP	-273	1.47	0	0	0	0	0	0	Deg C
SOLAR_DETECTOR_I	-667	4.017	0	0	0	0	0	0	pA
GPC1_MG_VOLTAGE	0	0.507	0	0	0	0	0	0	Volts
GPC2_AL_VOLTAGE	0	0.507	0	0	0	0	0	0	Volts
GPC3_UN_VOLTAGE	0	0.507	0	0	0	0	0	0	Volts
BIAS_VOLTAGE	0	0.507	0	0	0	0	0	0	Volts
GPC1_MG_SUPPLY_TEMP	-99.4	1.028	0	0	0	0	0	0	Deg C
GPC2_AL_SUPPLY_TEMP	-101.4	1.028	0	0	0	0	0	0	Deg C
GPC3_UN_SUPPLY_TEMP	-100.4	1.028	0	0	0	0	0	0	Deg C
BIAS_SUPPLY_TEMP	-98.3	1.028	0	0	0	0	0	0	Deg C

	Conversion Equation^¥			Units
GPC1_MG_MINUS_5V	0.02559GPC1_MG_MINUS_5V -0.068202GPC1_MG_PLUS_5V			Volts
GPC2_AL_MINUS_5V	0.02559GPC2_AL_MINUS_5V -0.068202GPC2_AL_PLUS_5V			Volts
GPC3_UN_MINUS_5V	0.02559GPC3_UN_MINUS_5V -0.068202GPC3_UN_PLUS_5V			Volts
SAX_MINUS_5V	0.02559SAX_MINUS_5V -0.068202SAX_PLUS_5V			Volts

	Conversion Equation^§					Units
MXU_TEMP	MXU_TEMP(-26.226ln(MXU_TEMP+1)+129.14)					Deg C
SOLAR_DETECTOR_TEMP (Hi)	4.57782E-09SOLAR_DETECTOR_TEMP⁵ - 3.16578E-06SOLAR_DETECTOR_TEMP⁴ + 8.58411E-04*SOLAR_DETECTOR_TEMP³					Deg C
	- 1.11961E-01SOLAR_DETECTOR_TEMP² + 7.16858E+00SOLAR_DETECTOR_TEMP - 1.23365E+2
SOLAR_DETECTOR_TEMP (Lo)	2.06686[ln(SOLAR_DETECTOR_TEMP+1)]² - 38.94592ln(SOLAR_DETECTOR_TEMP+1) +107.39573					Deg C