Analysis of Mars Odyssey Fast Neutron Data to Constrain the Hydrogen Abundance and Stratigraphy Near the South Pole

Details Analysis of Mars Odyssey Fast Neutron Data to Constrain the Hydrogen Abundance and Stratigraphy Near the South Pole Analysis of Mars Odyssey Fast Neutron Data to Constrain the Hydrogen Abundance and Stratigraphy Near the South Pole

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p11b..05p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #P11B-05

Physics

5410 Composition, 5462 Polar Regions, 6225 Mars

Scientific paper

We have analyzed fast neutron data measured by the Neutron Spectrometer subsystem of the Mars Odyssey Gamma Ray Spectrometer for 11 Ls intervals (each approximately 7.5 degrees) from February 18 to August 31, 2002. The fast neutron count rate depends on the abundance of hydrogen and stratigraphy, and is relatively insensitive to the type of material in which the hydrogen is mixed (for example, andesite vs. basalt). The fast neutron output also depends on atmospheric mass, more so at equatorial latitudes than do the thermal and epithermal energy bands. Consequently, the combination of fast- and epithermal-neutron fluxes, along with thermal neutrons and/or the flux of hydrogen neutron-capture gamma rays, can be used to simultaneously determine near-surface hydrogen abundance, its stratigraphy, and the atmospheric mass. In this study, maps of fast neutron count rates are combined with maps of the thermal- and epithermal neutrons and the hydrogen capture gamma ray intensity to study the polar terrain south of -60 degrees latitude as a function of time.

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