Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p11a1334z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P11A-1334
Physics
[6299] Planetary Sciences: Solar System Objects / General Or Miscellaneous
Scientific paper
Investigations of the energy relaxation of fast atoms in atmospheres of the terrestrial planets are important for understanding the energy balance of planetary coronae and modeling escape fluxes of neutral atoms. A comparative theoretical analysis of the thermalization of hot oxygen atoms in the atmospheres of Mars and Earth has been carried out by means of Monte Carlo simulations using the accurate energy dependent differential cross sections, describing the energy transfer in atom-atom and atom-molecular collisions. Upward fluxes of energetic O have been computed simultaneously with corresponding escape flux of secondary energetic He atom. Global energy flux transferred to each atmospheric constituent has been analyzed including the fractions channeled into the ro-vibrational degrees of freedom of atmospheric molecules. Inadequacies of modeling atmospheric processes with hard-sphere cross-sections have been explored.
Dalgarno Alexander
Kharchenko Vasili
Zhang Pei-Pei
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