期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 123, 期 8, 页码 6639-6654出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JA025543
关键词
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资金
- NASA through MAVEN project [NNH10CC04C]
- NASA [80NSSC18K0288, NNX14AH19G, NNX16AQ04G]
- NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center
- National Science Foundation
- NASA [896898, NNX16AQ04G, 682997, NNX14AH19G] Funding Source: Federal RePORTER
We study roles of the thermosphere and exosphere on the Martian ionospheric structure and ion escape rates in the process of the solar wind-Mars interaction. We employ a four-species multifluid magnetohydrodynamic model to simulate the Martian ionosphere and magnetosphere. The cold thermosphere background is taken from the Mars Global Ionosphere Thermosphere Model, and the hot oxygen exosphere is adopted from the Mars exosphere Monte Carlo model-Adaptive Mesh Particle Simulator. A total of four cases with the combination of 1-D (globally averaged) and 3-D thermospheres and exospheres are studied. The ion escape rates calculated by adopting 1-D and 3-D atmospheres are similar; however, the latter are required to adequately reproduce the ionospheric observations by the Mars Atmosphere and Volatile EvolutioN mission. In addition, our simulations show that the 3-D hot oxygen corona plays an important role in preventing planetary molecular ions (O-2(+) and CO2+) escaping from Mars, mainly resulting from the mass loading of the high-altitude exospheric O+ ions. The cold thermospheric oxygen atom, however, is demonstrated to be the primary neutral source for O+ ion escape during the relatively weak solar cycle 24.
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