Global distribution of neutrons from Mars: results from Mars odyssey |
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Authors: | Feldman W C Boynton W V Tokar R L Prettyman T H Gasnault O Squyres S W Elphic R C Lawrence D J Lawson S L Maurice S McKinney G W Moore K R Reedy R C |
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Affiliation: | Los Alamos National Laboratory, Los Alamos, NM 87545, USA. wfeldman@lanl.gov |
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Abstract: | Global distributions of thermal, epithermal, and fast neutron fluxes have been mapped during late southern summer/northern winter using the Mars Odyssey Neutron Spectrometer. These fluxes are selectively sensitive to the vertical and lateral spatial distributions of H and CO2 in the uppermost meter of the martian surface. Poleward of +/-60 degrees latitude is terrain rich in hydrogen, probably H2O ice buried beneath tens of centimeter-thick hydrogen-poor soil. The central portion of the north polar cap is covered by a thick CO2 layer, as is the residual south polar cap. Portions of the low to middle latitudes indicate subsurface deposits of chemically and/or physically bound H2O and/or OH. |
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