Mars' exosphere : Three dimensional multi-species thermal and nonthermal models

Details Mars' exosphere : Three dimensional multi-species thermal and nonthermal models Mars' exosphere : Three dimensional multi-species thermal and nonthermal models

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41b1865y&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM41B-1865

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[0328] Atmospheric Composition And Structure / Exosphere

Scientific paper

The escaping rate of Mars' atmosphere is an important issue for its evolution. However, before knowing the atmospheric escape, it is crucial to well describe Mars' upper atmosphere and exosphere. In this presentation, a three dimensional exospheric model of the main constituents of Mars' thermosphere will be presented. This model describes the Martian exosphere as a two components non-collisionnal atmosphere with a thermal component and a non-thermal component. The thermal components are computed by a modified Chamberlain approach which is extended to three dimensional including planetary rotation. Monte Carlo test particle scheme is used to simulate nonthermal components which are produced by dissociative recombination (DR) of O2+ and CO+, by exothermic photo-chemical reactions and by picked up ion sputtering. The reimpacting flux is calculated from a 3-D hybrid model which simulates the interaction between the solar wind and Mars' (see Modolo et al. abstract). The thermospheric and ionospheric conditions are calculated using Mars Global Circulation Model (see Chaufray et al. abstract). In this presentation, we will present the main results of this work, that is, the potential role of Mars' exosphere in the interaction with the solar wind, the signatures of the thermosphere/ionosphere in Mars' exosphere and the different channels of atmospheric escape. This work is part of a project named HELIOSARES aiming to describe Mars' interaction with the solar wind.

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