Sputtering of Mars Atmosphere by O+ Pick-up Ions: New Insights

Details Sputtering of Mars Atmosphere by O+ Pick-up Ions: New Insights Sputtering of Mars Atmosphere by O+ Pick-up Ions: New Insights

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.7204l&link_type=abstract

American Astronomical Society, DPS meeting #31, #72.04

Astronomy and Astrophysics

Astronomy

Scientific paper

We calculate the sputtering of an O thermosphere by incident O(+) ions using a Direct Simulation Monte Carlo method (DSMC) for a 2-D representation of the Mars atmosphere. The calculations are carried out for a number of possible pick-up ions fluxes corresponding to different solar intensities. The goal here is to consider the loss of atmosphere in earlier epochs when the Mars thermosphere was dominated by neutral oxygen atoms. The sputter-produced ejecta and enhanced population of the corona generated by the incident pick-up ions will be described: their spatial and energy distributions at each solar intensity. These results will be compared to those from the standard 1-D atmospheric sputtering calculations and will be used to estimate the effect of feedback processes on the sputter-induced loss of atmosphere on Mars.

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