High energy hydrogen exospheres at Mars and Venus: A hybrid modeling study

Details High energy hydrogen exospheres at Mars and Venus: A hybrid modeling study High energy hydrogen exospheres at Mars and Venus: A hybrid modeling study

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..764k&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Abstract We have studied the energetic hydrogen exosphere component at Mars and Venus. The energetic hydrogen exosphere component (Hsw, Hexo) is formed when fast protons, either solar wind protons (H+ sw) or protons originating from the ionized hydrogen exosphere and picked up by the solar wind (H+ exo) and then undergo a charge exchange reaction with the neutral hydrogen corona (H+ sw + H -> Hsw + H+ and H+ exo + H -> Hexo + H+) or the neutral oxygen corona (H+ sw + O -> Hsw + O+ and H+ exo + O -> Hexo + O+). This energetic hydrogen exosphere component forms a second component of the neutral exosphere, in addition to the more well-known "low-energy" hydrogen neutral exosphere component (Hlow). Recently, the energetic hydrogen exosphere component has received attention when Lyman alpha and ion cyclotron wave observations at Mars and Venus were analyzed. In this work we analyze the generation and properties of the energetic hydrogen exosphere component by a quasi-neutral hybrid Mars model (HYB-Mars) and Venus model (HYB-Venus). These models are selfconsistent models, incorporating finite ion gyroradius effects because ions are modeled as particles accelerated by the Lorentz force. We present threedimensional Hsw and Hexo neutral density profiles at Mars and Venus. A special emphasis is placed to studying possible hydrogen exosphere asymmetries associated with H+ ion gyromotion effects.

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