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Seasonal CO2 Observations on North and South of Mars as Seen by HEND (Mars Odyssey) and MOLA (MGS)The first year of neutron mapping measurements from the Mars Odyssey spacecraft are presented based on observations from the High Energy Neutron Detector (HEND). The HEND instrument is a part of GRS suite responsible for registration of epithermal and fast neutrons originating in the Mars subsurface layer. The gamma ray and neutron spectrometers measure the scattering of fast neutrons from the Martian surface, which is caused by bombardment of primary cosmic rays and is strongly sensitive to the presence of hydrogen atoms. Even several percent subsurface hydrogen significantly depresses the flux of epithermal and fast neutrons. The recent Mars Odyssey observations detected a considerable amount of hydrogen, almost certainly corresponding to water ice, in the shallow near surface of the southern and northern hemispheres of Mars.
Document ID
Acquisition Source
Document Type
Conference Paper
Litvak, M. L.
(Academy of Sciences (USSR) Moscow, USSR)
Mitrofanov, I. G.
(Academy of Sciences (USSR) Moscow, USSR)
Smith, D. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zuber, M. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boynton, W.
(Arizona Univ. Tucson, AZ, United States)
Saunders, R. S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Drake, D.
(Los Alamos National Lab. NM, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public Use Permitted.
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