Statistics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2420f&link_type=abstract
American Astronomical Society, DPS meeting #39, #24.20; Bulletin of the American Astronomical Society, Vol. 39, p.457
Statistics
Scientific paper
We report a newly-created highly-parallelized global test particle model for resolving the pickup oxygen ion distribution around Mars. The background magnetic and convection electric fields are calculated using a state-of-the-art three-dimensional multi-species MHD model. In addition to photo-ionization, charge exchange collisions and solar wind electron impact ionization are included for the pickup ion generation. The most novel feature of our model is that more than one billion test particles are launched in the simulation domain in total. This corresponds to a profound enhancement by at least 3 orders of magnitude in the total number compared to all existing test particle models. This substantial improvement enables an unprecedented examination of the pickup ion flux distribution in the velocity space, which is far from being able to be simulated in previous studies due to the insufficient statistics arising from the limited number of test particles. Using the velocity space distribution of pickup oxygen ions as a tool, the Mars-solar wind interaction can be investigated in a unique way. The velocity space distribution carries important information about the planetary atmospheric escape. Trajectory tracing in a reverse direction is capable of locating the source regions of particles passing through any spatial point. Given the fact that the particle transport is strongly affected by the electromagnetic environment, the velocity space distribution can thus be used as a unique tool to probe the Mars-solar wind interaction.
de Zeeuw D.
Fang Xiaohua
Kozyra Janet
Liemohn Michael
Ma Yi
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