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| Titel |
Three dimensional Mars' exosphere : multi-species thermal and nonthermal models |
| VerfasserIn |
Manabu Yagi, Francois Leblanc, Jean-Yves Chaufray, Ronan Modolo, Marco Mancini, Francisco González-Galindo |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048994
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| Zusammenfassung |
| 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 two components of non-collisional atmosphere with thermal components and
non-thermal components. The thermal components of O and CO2 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 of O
and C which are produced by dissociative recombination (DR) of O2+ and CO+, by
exothermic photo-chemical reactions and by picked up ion sputtering. The thermospheric and
ionospheric conditions are calculated by Mars Global Circulation Model. In this presentation,
we will present the main results of this work, that is, the signatures of the Mars’
exosphere and the atmospheric escape of each species. This work is part of a project
named HELIOSARES aiming to describe Mars’ interaction with the solar wind. |
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