Publication Date:
2002-06-01
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉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 -- New York, N.Y. -- Science. 2002 Jul 5;297(5578):75-8. Epub 2002 May 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Los Alamos National Laboratory, Los Alamos, NM 87545, USA. wfeldman@lanl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12040088" target="_blank"〉PubMed〈/a〉
Keywords:
Dry Ice
;
Extraterrestrial Environment
;
Gamma Rays
;
*Hydrogen
;
Ice
;
*Mars
;
*Neutrons
;
Spacecraft
;
Spectrometry, Gamma
;
Spectrum Analysis
;
Temperature
;
Water
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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