Hybrid simulations of the proton precipitation patterns onto the upper atmosphere of Mars

Dieval, Catherine and Kallio, Esa and Stenberg, Gabriella and Barabash, Stas and Jarvinen, Riku (2012) Hybrid simulations of the proton precipitation patterns onto the upper atmosphere of Mars. Earth, Planets and Space, 64 (2). pp. 121-134. ISSN 1343-8832

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Abstract

We study the dependence of proton precipitation patterns onto the Martian upper atmosphere on altitude, proton energy, proton origin, and in a lesser extent, solar zenith angle, using the HYB-Mars model, a 3D quasineutral hybrid model. We find that the flux of precipitating protons has a strong altitude dependence: on the dayside, the flux of precipitating protons decreases substantially when the altitude over Mars decreases. We also find that the contribution of exospheric protons to the deposition is significant and its spatial distribution is not identical to that of the solar wind protons. In addition, the low energy proton population comes mainly from the newborn planetary protons. The energized pick-up protons and solar wind protons contribute to the higher energy proton population. The study also confirms that the proton precipitation is highly asymmetric with respect to the direction of the convection electric field in the solar wind. The study implies that the Martian induced magnetosphere protects the upper atmosphere effectively against proton precipitation.

Item Type: Journal Article
Journal or Publication Title: Earth, Planets and Space
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 76663
Deposited By: ep_importer_pure
Deposited On: 13 Nov 2015 14:30
Refereed?: Yes
Published?: Published
Last Modified: 19 Feb 2020 02:39
URI: https://eprints.lancs.ac.uk/id/eprint/76663

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