A full-particle Martian upper thermosphere-exosphere model using the DSMC method

Abstract : A one-dimensional full-particle model of the Martian upper thermosphere-exosphere has been developed, where the Direct Simulation Monte Carlo (DSMC) method is applied to both thermal and non-thermal components. Our full-particle model can self-consistently solve the transition from collisional to collisionless domains in the upper thermosphere, so that the energy deposition from non-thermal energetic components to thermal components in the transition region is properly described. For the solar EUV condition during the Viking-1 measurement (1 EUV case), computed density profiles are in good agreement with those observed by Viking 1 and with the conventional model. For a solar EUV flux six times the Viking-1 condition (6 EUV case), the computed heating efficiency is essentially the same as 1 EUV case but slightly increases by about 10 % below the exobase, and temperature deviates from the conventional model in and above the transition region. This result suggests that the conventional heating efficiency of 0.18 is a good approximation for low (1 EUV case) to moderately strong (6 EUV case) solar EUV conditions but would be inappropriate for an extremely strong solar EUV (up to ~100 times stronger flux) environment. We also find that applying different models of the CO2-O collisional energy transfer rate results in a difference in the calculated exobase temperature by 150 K for 6 EUV case.
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Journal of Geophysical Research. Planets, Wiley-Blackwell, 2016, 121 (8), pp.1429-1444. 〈10.1002/2015JE004961〉
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Soumis le : vendredi 12 août 2016 - 20:46:58
Dernière modification le : mercredi 19 septembre 2018 - 01:24:19

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Kaori Terada, Naoki Terada, Hiroyuki Shinagawa, Hitoshi Fujiwara, Yasumasa Kasaba, et al.. A full-particle Martian upper thermosphere-exosphere model using the DSMC method. Journal of Geophysical Research. Planets, Wiley-Blackwell, 2016, 121 (8), pp.1429-1444. 〈10.1002/2015JE004961〉. 〈insu-01353759〉

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