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
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
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.
A Spectrometer Team document (in Adobe Acrobat format)
that provides a technical description of the Lunar Prospector
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.
The Lunar Prospector spectrometer data are stored in a
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
Thermal and Epithermal Neutron Count Rates (Each file is 71
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.
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. The APS
files are accessible by anonymous FTP at this URL:
These maps were produced by the Lunar Prospector Spectrometer Team.
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