Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14033l&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14033
Computer Science
Scientific paper
The HEND instrument is a part of GRS suite responsible for registration of epithermal and fast neutrons originating in the Mars subsurface layer. Observations of surface composition based on neutron measurements are most effective only within 1-2 m of the surface. Thus, the seasonal CO_2 coverage, which may achieve up to 1.5 m thickness in the polar regions, hides the subsurface layer from the observer. Mars Odyssey observations from the first mapping year tracked seasonal changes from late winter in the northern hemisphere (NH) to NH summer. We have analyzed the data to search for variations in the epithermal neutron flux caused by the sublimation of CO_2 snow in NH and the accumulation of CO_2 coverage in southern hemisphere (SH). To attempt to detect seasonal effects in the neutron data, we divide the northern and southern hemisphere regions into several latitude belts. We averaged the neutron flux within given latitude belt and studied the dependence of averaged neutron flux versus solar longitude (L_s). The first direct measurements of seasonal variations in CO_2 snow depth were obtained by the MOLA instrument on the Mars Global Surveyor (MGS) spacecraft for the previous Martian year. To study the behavior of seasonal CO_2 coverage, we combined HEND and MOLA observations within the same latitude belts for the same Martian seasons. The result shows an excellent correlation between the epithermal neutron flux observed by HEND and the snow depth measured by MOLA for different latitude belts. The interpolation of the relationship between HEND and MOLA data provides the ability to measure CO_2 snow depth from several cm, where HEND has significant efficiency, up to 1-2 meters, at which MOLA measurements are most accurate.
Boynton William
Drake Dan
Litvak Maxim L.
Mitrofanov Igor G.
Saunders Stephen R.
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