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Lunar Prospector Level
1 Spectrometer Data
Lunar Prospector gamma ray, neutron, and alpha particle spectrometer Level 1
data sets and associated documentation are available from the PDS Geosciences
Node. These data products and documentation have been prepared by the Lunar
Prospector Spectrometer Team at the Los Alamos National Laboratory. The Level 1
products typically are expressed in counts rather than abundances or fluxes.
Color-coded maps derived from these data are also available for browsing. Higher
level products will be posted as they become available.
These spectrometer data products integrate data collected between January 16,
1998 and July 31, 1999.
IMPORTANT: The data on this page are special products that may be of
interest to the geoscience community. They do not represent a PDS peer-reviewed
archive. Please report any other anomalies in the data or documentation to
geosci@wunder.wustl.edu.
Documentation
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A README file for this data release as submitted by the Lunar Prospector
Spectrometer Team.
Data Product Description
Three documents (in Adobe Acrobat format) that describe the file formats for
the spectrometer data products.
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A Spectrometer Team document (in Adobe Acrobat format) that provides a
technical description of the Lunar Prospector spectrometers.
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A file that lists times of solar energetic particle events. Gamma ray and
neutron spectrometer data are omitted from the data products for these time
periods. The file also lists times of gain changes for the gamma ray
spectrometer and other significant mission events.
Data
The Lunar Prospector spectrometer data are stored in a
Common Data Format (CDF) file structure.
Your browser's "SAVE LINK AS" function can be used to download these data files.
A
procedure that can import the spectrometer
data into IDL has been provided by the LP Spectrometer Team.
Integrated Gamma Ray Spectra (Each file is 14.7 Mbytes)
Files containing integrated gamma ray spectra for the entire Moon. The
individual gamma ray spectra have been integrated over a given time period and
binned into 5 x 5 degree cells. Each integrated spectra has 512 channels. Values
are in units of counts per 32-seconds (The instrument takes 32 seconds to
acquire a spectrum).
Thorium and Potassium Count Rates (Each file is 71 kbytes)
Files containing thorium and potassium count rates derived from gamma ray
spectra. The data have been binned into 5 x 5 degree cells that cover the entire
Moon. The thorium count rate is the sum of counts from within an energy band
(2.4 to 2.8 MeV) around the thorium gamma ray line of 2.6 MeV. The potassium
count rate is the sum of counts from within an energy band (1.3 to 1.5 MeV)
around the potassium gamma ray line of 1.46 MeV. Values are in units of counts
per 32-seconds.
Thermal and Epithermal Neutron Count Rates (Each file is 71 kbytes)
Files containing thermal and epithermal neutron count rates derived from
neutron spectra. The data have been binned into 5 x 5 degree cells that cover
the entire Moon. The thermal neutron count rate is the difference in the count
rate between the HeCd and HeSn detectors. The epithermal neutron count rate is
the count rate of the HeCd detector. Values are in units of counts per
32-seconds.
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The Alpha Particle Spectrometer (APS) data are organized by time. Each file
contains approximately one day of data. Each record includes time of day,
latitude, longitude, height of spacecraft above the surface, APS face number,
look angle, and energy level.
Maps
These maps were produced by the Lunar Prospector Spectrometer Team.
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The LP Level 1 spectrometer data are provided by the PDS Geosciences Node
for use by the planetary community and the interested public. Copies of the data
will also be available through the National Space Science Data Center (NSSDC).
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