Consequences of simulated ion precipitation and sputtering during extreme conditions at Mars: comparison to MAVEN observations

Abstract : Mars lacks an intrinsic dipole magnetic field, creating a scenario where the solar wind directly interacts with the upper atmosphere and newly created ions can be picked up and swept away by the background convection electric field. These pick-up ions can directly escape or precipitate back into the atmosphere and induce atmospheric sputtering of neutrals. Sputtering is believed to be one of the main drivers of atmospheric escape during the early epochs of our solar system when the solar activity and EUV intensities were much higher than the present day. Using the March 8th ICME event and other extreme solar wind events, we simulate three phases of the Mars-solar wind interaction using fluid and kinetic models and compare the predicted heavy ion precipitation with MAVEN observations in order to derive heavy ion precipitation and the first set of data-based sputtering rates. The fluid model reproduces the observed features in the solar wind density, velocity and magnetic field seen along the MAVEN orbit during the March 8th ICME event, and the subsequent precipitation shows strong agreement with other published predictions of sputtering in extreme conditions.
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https://hal-insu.archives-ouvertes.fr/insu-01249464
Contributeur : Catherine Cardon <>
Soumis le : vendredi 1 janvier 2016 - 18:38:41
Dernière modification le : mercredi 19 septembre 2018 - 01:29:53

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  • HAL Id : insu-01249464, version 1

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Shannon M. Curry, Janet Luhmann, Chuanfei Dong, François Leblanc, Ronan Modolo, et al.. Consequences of simulated ion precipitation and sputtering during extreme conditions at Mars: comparison to MAVEN observations. AGU Fall Meeting 2015, Dec 2015, San Francisco, United States. pp.P21A-2089. 〈insu-01249464〉

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