PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 56 FILE_RECORDS = 132 ^RSED_HDR_TABLE = ("2307N00A.EDS",1) ^RSED_TABLE = ("2307N00A.EDS",6) INSTRUMENT_HOST_NAME = "MARS GLOBAL SURVEYOR" TARGET_NAME = "MARS" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" DATA_SET_ID = "MGS-M-RSS-5-SDP-V1.0" PRODUCT_ID = "2307N00A.EDS" PRODUCT_RELEASE_DATE = 2004-05-19 DESCRIPTION = "This file contains an ionospheric electron density profile derived from MGS radio occultation data. Raw samples of DSN receiver output were corrected for observing conditions and converted to bending angle as a function of impact parameter. These results were then inverted to refractive index as a function of radius via an Abel transform. Electron number density was obtained from refractive index using a conversion formula appropriate to the measurement frequency (8423 MHz). For more details see Hinson et al. (J. Geophys. Res., 104, 26997-27012, 1999; J. Geophys. Res., 103, 9505-9520, 1998) and Bougher et al. (Geophys. Res. Lett., 28, 3091-3094, 2001)." START_TIME = 2002-11-03T13:00:00Z STOP_TIME = 2002-11-03T13:10:00Z SOFTWARE_NAME = "EDS; V1.3" PRODUCT_CREATION_TIME = 2004-05-19T03:15:02Z PRODUCER_ID = "MGS RST" OBJECT = RSED_HDR_TABLE ROWS = 1 COLUMNS = 25 ROW_BYTES = 280 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The RSED header contains ancillary data associated with ionospheric electron density profiles. Each header includes a single row of 25 data columns delimited by ASCII commas (263 total bytes), 15 ASCII blank characters to pad out the record, and an ASCII carriage-return line-feed pair at the end." OBJECT = COLUMN NAME = "START TIME" COLUMN_NUMBER = 1 DATA_TYPE = TIME START_BYTE = 1 BYTES = 23 UNIT = "N/A" DESCRIPTION = "The Earth Receive Time at which the first radio occultation data sample was acquired." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "STOP TIME" COLUMN_NUMBER = 2 DATA_TYPE = TIME START_BYTE = 25 BYTES = 23 UNIT = "N/A" DESCRIPTION = "The Earth Receive Time at which the last radio occultation data sample was acquired." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "OCCULTATION TIME" COLUMN_NUMBER = 3 DATA_TYPE = TIME START_BYTE = 49 BYTES = 23 UNIT = "N/A" DESCRIPTION = "The time at Mars when the experiment was sounding the ionosphere at 130 km altitude. This is computed by subtracting the Mars-to-Earth light time from the appropriate Earth Receive Time." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ORBIT NUMBER" COLUMN_NUMBER = 4 DATA_TYPE = ASCII_INTEGER START_BYTE = 73 BYTES = 5 FORMAT = "I5" UNIT = "N/A" DESCRIPTION = "Orbit number from which the data were acquired; set to zero if not known." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "DSN ANTENNA NUMBER" COLUMN_NUMBER = 5 DATA_TYPE = ASCII_INTEGER START_BYTE = 79 BYTES = 2 FORMAT = "I2" UNIT = "N/A" DESCRIPTION = "Number of the DSN antenna used to collect the data (e.g., 14, 43, 65, ...)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "RAY PATH DIRECTION" COLUMN_NUMBER = 6 DATA_TYPE = ASCII_REAL START_BYTE = 82 BYTES = 6 FORMAT = "F6.1" UNIT = "DEGREE" DESCRIPTION = "The angle between local north and the direction of radio signal propagation at the point of closest approach to Mars. Angle is measured positive from local north toward local east. A signal traveling from west toward east would have a ray-path-direction of 90 degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ANGLE FROM DIAMETRIC" COLUMN_NUMBER = 7 DATA_TYPE = ASCII_REAL START_BYTE = 89 BYTES = 6 FORMAT = "F6.1" UNIT = "DEGREE" DESCRIPTION = "Angle at which the spacecraft rises or sets behind the planet limb, measured clockwise from the planet radial direction as viewed from Earth. An angle- from-diametric equal to zero indicates a diametric occultation with motion of the ray away from the surface (e.g., occultation egress). A value near 180 degrees is a nearly diametric ingress occultation." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LATITUDE OF PROFILE" COLUMN_NUMBER = 8 DATA_TYPE = ASCII_REAL START_BYTE = 96 BYTES = 7 FORMAT = "F7.3" UNIT = "DEGREE" DESCRIPTION = "Areocentric (north) latitude where the experiment sounded the ionosphere at 130 km altitude." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA LATITUDE" COLUMN_NUMBER = 9 DATA_TYPE = ASCII_REAL START_BYTE = 104 BYTES = 6 FORMAT = "F6.3" UNIT = "DEGREE" DESCRIPTION = "One standard deviation uncertainty in LATITUDE OF PROFILE. This value also serves as an estimate of the uncertainty in LATITUDE in RSED_TABLE. Set to -9.999 if not known." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LONGITUDE OF PROFILE" COLUMN_NUMBER = 10 DATA_TYPE = ASCII_REAL START_BYTE = 111 BYTES = 8 FORMAT = "F8.3" UNIT = "DEGREE" POSITIVE_LONGITUDE_DIRECTION = "EAST" DESCRIPTION = "Areocentric east longitude where the experiment sounded the ionosphere at 130 km altitude." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA LONGITUDE" COLUMN_NUMBER = 11 DATA_TYPE = ASCII_REAL START_BYTE = 120 BYTES = 6 FORMAT = "F6.3" UNIT = "DEGREE" DESCRIPTION = "One standard deviation uncertainty in LONGITUDE OF PROFILE. This value also serves as an estimate of the uncertainty in LONGITUDE in RSED_TABLE. Set to -9.999 if not known." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SUB-SOLAR LATITUDE" COLUMN_NUMBER = 12 DATA_TYPE = ASCII_REAL START_BYTE = 127 BYTES = 6 FORMAT = "F6.2" UNIT = "DEGREE" DESCRIPTION = "Areocentric (north) latitude of the sun at OCCULTATION TIME." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SUB-SOLAR LONGITUDE" COLUMN_NUMBER = 13 DATA_TYPE = ASCII_REAL START_BYTE = 134 BYTES = 7 FORMAT = "F7.2" UNIT = "DEGREE" POSITIVE_LONGITUDE_DIRECTION = "EAST" DESCRIPTION = "Areocentric east longitude of the sun in body fixed coordinates at OCCULTATION TIME." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SOLAR LONGITUDE" COLUMN_NUMBER = 14 DATA_TYPE = ASCII_REAL START_BYTE = 142 BYTES = 6 FORMAT = "F6.2" UNIT = "DEGREE" DESCRIPTION = "Value of the angle between the Mars-Sun line at OCCULTATION TIME and the Mars-Sun line at the Mars vernal equinox. Measured positive with increasing time following the vernal equinox. Sometimes denoted L-sub-s." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SPACECRAFT TO LIMB DISTANCE" COLUMN_NUMBER = 15 DATA_TYPE = ASCII_REAL START_BYTE = 149 BYTES = 9 FORMAT = "E9.3" UNIT = "METER" DESCRIPTION = "Distance along ray path from spacecraft to point of closest approach to Mars. Measured at time when experiment was sounding the ionosphere at 130 km altitude." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SPACECRAFT TO DSN DISTANCE" COLUMN_NUMBER = 16 DATA_TYPE = ASCII_REAL START_BYTE = 159 BYTES = 9 FORMAT = "E9.3" UNIT = "METER" DESCRIPTION = "Distance from spacecraft to DSN receiving antenna at time when experiment was sounding the ionosphere at 130 km altitude." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MARS TO SUN DISTANCE" COLUMN_NUMBER = 17 DATA_TYPE = ASCII_REAL START_BYTE = 169 BYTES = 9 FORMAT = "E9.3" UNIT = "METER" DESCRIPTION = "Distance from Mars to Sun at OCCULTATION TIME." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LOCAL TRUE SOLAR TIME" COLUMN_NUMBER = 18 DATA_TYPE = ASCII_REAL START_BYTE = 179 BYTES = 6 FORMAT = "F6.3" UNIT = "HOUR" DESCRIPTION = "Local true solar time (LTST) at the time and location of the occultation measurement. LTST at the sub-solar longitude is defined as 12 solar hours. LTST on other meridians changes by one solar hour for each 15 degree increment in longitude. Thus, LTST for the occultation measurement is given by 12 + (LONGITUDE_OF_PROFILE - SUB-SOLAR_LONGITUDE)/15." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SOLAR ZENITH ANGLE" COLUMN_NUMBER = 19 DATA_TYPE = ASCII_REAL START_BYTE = 186 BYTES = 6 FORMAT = "F6.2" UNIT = "DEGREE" DESCRIPTION = "Angle between the direction to Sun and local vertical direction on Mars at time and location of the occultation measurement." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SUN-EARTH-SPACECRAFT ANGLE" COLUMN_NUMBER = 20 DATA_TYPE = ASCII_REAL START_BYTE = 193 BYTES = 5 FORMAT = "F5.1" UNIT = "DEGREE" DESCRIPTION = "Approximate angle between Sun and spacecraft as viewed from Earth during experiment." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "DSN ELEVATION ANGLE" COLUMN_NUMBER = 21 DATA_TYPE = ASCII_REAL START_BYTE = 199 BYTES = 5 FORMAT = "F5.1" UNIT = "DEGREE" DESCRIPTION = "Approximate angle between direction to spacecraft and local horizon at DSN receiving antenna during experiment." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "GRAVITY FIELD MODEL" COLUMN_NUMBER = 22 DATA_TYPE = CHARACTER START_BYTE = 206 BYTES = 12 FORMAT = "A12" UNIT = "N/A" DESCRIPTION = "File name of gravity field spherical harmonic model used in defining reference areoid." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "PCK FILE NAME" COLUMN_NUMBER = 23 DATA_TYPE = CHARACTER START_BYTE = 221 BYTES = 12 FORMAT = "A12" UNIT = "N/A" DESCRIPTION = "File name of the NAIF Planetary Constants File used in this retrieval and calculation (name of the PCK file as stored in the MGS RST data system)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "TRAJECTORY FILE NAME" COLUMN_NUMBER = 24 DATA_TYPE = CHARACTER START_BYTE = 236 BYTES = 12 FORMAT = "A12" UNIT = "N/A" DESCRIPTION = "File name of the spacecraft and planetary ephemeris file used in this retrieval and calculation (name of the file as stored in the MGS RST data system)." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SPACECRAFT ATTITUDE FILE NAME" COLUMN_NUMBER = 25 DATA_TYPE = CHARACTER START_BYTE = 251 BYTES = 12 FORMAT = "A12" UNIT = "N/A" DESCRIPTION = "File name of the spacecraft attitude file used in this retrieval and calculation (name of the file as stored in the MGS RST data system). Left blank if not known or no attitude file was used." END_OBJECT = COLUMN END_OBJECT = RSED_HDR_TABLE OBJECT = RSED_TABLE ROWS = 127 COLUMNS = 6 ROW_BYTES = 56 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "Table contains radio science ionospheric electron density profile. Each row in the table contains data for 6 columns delimited by ASCII commas (54 bytes total) and an ASCII carriage-return line-feed pair at the end." OBJECT = COLUMN NAME = "RADIUS" COLUMN_NUMBER = 1 DATA_TYPE = ASCII_REAL START_BYTE = 1 BYTES = 8 FORMAT = "F8.0" UNIT = "METER" DESCRIPTION = "Measurement radius." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ALTITUDE" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 10 BYTES = 7 FORMAT = "F7.0" UNIT = "METER" DESCRIPTION = "Altitude of measurement above reference areoid. The reference areoid is the equipotential surface whose mean equatorial radius is 3,396,000 m." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LATITUDE" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 18 BYTES = 7 FORMAT = "F7.3" UNIT = "DEGREE" DESCRIPTION = "Areocentric (north) latitude of measurement." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "LONGITUDE" COLUMN_NUMBER = 4 DATA_TYPE = ASCII_REAL START_BYTE = 26 BYTES = 8 FORMAT = "F8.3" UNIT = "DEGREE" POSITIVE_LONGITUDE_DIRECTION = "EAST" DESCRIPTION = "Areocentric (east) longitude of measurement in body fixed coordinates." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ELECTRON NUMBER DENSITY" COLUMN_NUMBER = 5 DATA_TYPE = ASCII_REAL START_BYTE = 35 BYTES = 11 FORMAT = "E11.4" UNIT = "1 PER CUBIC METER" DESCRIPTION = "Electron number density of the ionosphere at RADIUS, LATITUDE, LONGITUDE." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA ELECTRON NUMBER DENSITY" COLUMN_NUMBER = 6 DATA_TYPE = ASCII_REAL START_BYTE = 47 BYTES = 8 FORMAT = "E8.2" UNIT = "1 PER CUBIC METER" DESCRIPTION = "One standard deviation uncertainty in ELECTRON NUMBER DENSITY." END_OBJECT = COLUMN END_OBJECT = RSED_TABLE END