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Global Distribution of Neutrons from Mars: Results from Mars Odyssey
W. C. Feldman,1*W. V. Boynton,2R. L. Tokar,1T. H. Prettyman,1O. Gasnault,1S. W. Squyres,3R. C. Elphic,1D. J. Lawrence,1S. L. Lawson,1S. Maurice,4G. W. McKinney,1K. R. Moore,1R. C. Reedy1
Global distributions of thermal, epithermal, and fast neutron
fluxes have been mapped during late southern summer/northernwinter
using the Mars Odyssey Neutron Spectrometer. These fluxesare
selectively sensitive to the vertical and lateral spatialdistributions
of H and CO2 in the uppermost meter of the martiansurface.
Poleward of ±60° latitude is terrain rich in hydrogen,probably
H2O ice buried beneath tens of centimeter-thick
hydrogen-poorsoil. The central portion of the north polar cap is
covered bya thick CO2 layer, as is the residual south
polar cap. Portionsof the low to middle latitudes indicate subsurface
deposits ofchemically and/or physically bound H2O and/or
OH.
1 Los Alamos National Laboratory, Los Alamos,
NM 87545, USA.
2 University of Arizona, Lunar
Planetary Laboratory, Tucson, AZ 85721, USA.
3 Cornell University, Center for Radiophysics and
Space Research, Ithaca, NY 14853, USA.
4 Observatoire Midi-Pyrénées, 31400 Toulouse, France.
*
To whom correspondence should be addressed. E-mail:
wfeldman{at}lanl.gov
The editors suggest the following Related Resources on Science sites:
In Science Magazine
REPORTS
I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak, A. Sanin, V. Tret'yakov, A. Krylov, V. Shvetsov, W. Boynton, C. Shinohara, D. Hamara, and R. S. Saunders (5 July 2002) Science297 (5578), 78.
[DOI: 10.1126/science.1073616] |Abstract »|Full Text »|PDF »
REPORTS
W. V. Boynton, W. C. Feldman, S. W. Squyres, T. H. Prettyman, J. Brückner, L. G. Evans, R. C. Reedy, R. Starr, J. R. Arnold, D. M. Drake, P. A. J. Englert, A. E. Metzger, Igor Mitrofanov, J. I. Trombka, C. d'Uston, H. Wänke, O. Gasnault, D. K. Hamara, D. M. Janes, R. L. Marcialis, S. Maurice, I. Mikheeva, G. J. Taylor, R. Tokar, and C. Shinohara (5 July 2002) Science297 (5578), 81.
[DOI: 10.1126/science.1073722] |Abstract »|Full Text »|PDF »
PERSPECTIVES
Jim Bell (5 July 2002) Science297 (5578), 60.
[DOI: 10.1126/science.1074025] |Summary »|Full Text »|PDF »
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