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Hybrid simulations of proton precipitation patterns onto the upper atmosphere of Mars
Finnish Meteorological Institute.
Swedish Institute of Space Physics / Institutet för rymdfysik.
Swedish Institute of Space Physics / Institutet för rymdfysik.
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2012 (English)In: Earth Planets and Space, ISSN 1343-8832, E-ISSN 1880-5981, Vol. 64, no 2, p. 121-134Article in journal (Refereed) Published
Abstract [en]

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 quasi-neutral 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.

Place, publisher, year, edition, pages
2012. Vol. 64, no 2, p. 121-134
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-3258DOI: 10.5047/eps.2011.08.015Local ID: 11135767-0566-4c80-8c69-5ac8159b5b3cOAI: oai:DiVA.org:ltu-3258DiVA, id: diva2:976114
Note
Upprättat; 2012; 20121128 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Dieval, CatherineBarabash, Stas

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