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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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Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Wednesday, January 13, 2021 - 4:31:35 PM
Last modification on : Friday, January 7, 2022 - 6:48:09 PM
Long-term archiving on: : Wednesday, April 14, 2021 - 7:00:05 PM


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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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