Comparison of Global Martian Plasma Models in the Context of MAVEN Observations

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
University of Colorado Boulder
University of California Los Angeles
Princeton University
Université Paris-Saclay
Department of Electronics and Nanoengineering
University of Michigan, Ann Arbor
University of Iowa
University of California Berkeley
NASA Goddard Space Flight Center
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Journal of geophysical research: Space physics, Volume 123, issue 5
Global models of the interaction of the solar wind with the Martian upper atmosphere have proved to be valuable tools for investigating both the escape to space of the Martian atmosphere and the physical processes controlling this complex interaction. The many models currently in use employ different physical assumptions, but it can be difficult to directly compare the effectiveness of the models since they are rarely run for the same input conditions. Here we present the results of a model comparison activity, where five global models (single-fluid MHD, multifluid MHD, multifluid electron pressure MHD, and two hybrid models) were run for identical conditions corresponding to a single orbit of observations from the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We find that low-altitude ion densities are very similar across all models and are comparable to MAVEN ion density measurements from periapsis. Plasma boundaries appear generally symmetric in all models and vary only slightly in extent. Despite these similarities there are clear morphological differences in ion behavior in other regions such as the tail and southern hemisphere. These differences are observable in ion escape loss maps and are necessary to understand in order to accurately use models in aiding our understanding of the Martian plasma environment.
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Egan , H , Ma , Y , Dong , C , Modolo , R , Jarvinen , R , Bougher , S , Halekas , J , Brain , D , Mcfadden , J , Connerney , J , Mitchell , D & Jakosky , B 2018 , ' Comparison of Global Martian Plasma Models in the Context of MAVEN Observations ' , Journal of geophysical research: Space physics , vol. 123 , no. 5 , pp. 3714-3726 .