Time variation of nonthermal escape of oxygen from Mars after solar wind dynamic pressure enhancement

Details Time variation of nonthermal escape of oxygen from Mars after solar wind dynamic pressure enhancement Time variation of nonthermal escape of oxygen from Mars after solar wind dynamic pressure enhancement

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420201k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 20, CiteID L20201

Physics

5

Ionosphere: Planetary Ionospheres (5435, 5729, 6026), Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies, Atmospheric Composition And Structure: Exosphere, Planetary Sciences: Solar System Objects: Mars

Scientific paper

We investigate the nonthermal escape of oxygen from Mars due to the dissociative recombination of O2 +. By combining a time-dependent two-stream model for the nonthermal oxygen with an MHD model of the ionosphere-magnetosheath interaction, the response of the oxygen escape rate to time-varying solar wind conditions is examined. Over the last few decades a number of model calculations of expected nonthermal oxygen escape have been performed, but all assumed steady state conditions. In this study we calculate the time variation of the nonthermal escape rate after enhancement of the solar wind dynamic pressure. We find that the escape rate of nonthermal oxygen increases by a factor of about two to four as the ionosphere is compressed in response to solar wind dynamic pressure enhancement. We also find that in steady states the escape rate for high ionopause altitude cases (h ~ 600 km) is twice as large as that for low ionopause altitude cases (h ~ 250 km) due to non-negligible dissociative recombination above the exobase.

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