Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh41a0306s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH41A-0306
Physics
7833 Mathematical And Numerical Techniques (0500, 3200), 7845 Particle Acceleration, 7851 Shock Waves (4455)
Scientific paper
A new simulation model has been developed to understand the multi-scale coupling in space plasmas. In this new model, so-called "macro-micro interlocked simulation", Hall-MHD and PIC/Hybrid simulations are simultaneously performed, and the mutual interaction between them is handled self-consistently. The model can treat MHD-scale dynamics including particle kinetic effects (Sugiyama and Kusano, JCP, 2007). Here we have applied this interlocked simulation model onto a collisionless shock problem. Hall-MHD simulation covers the whole system, and, only in the shock transition region, PIC/Hybrid simulation is embedded to incorporate the wave-particle interaction for dissipation processes at shock. It has been demonstrated that the interlocked model can work well for the shock-related multiscale coupling processes: (1) the whistler waves excited in the shock transition region in PIC model propagate into the upstream region and modify the incoming plasma flow, and (2) the reflected ions at the shock transition region in Hybrid model escape into the far upstream region and excite the upstream Alfven waves. By following the motions of the escaped ions both in Hybrid region and in Hall-MHD region self-consistently, we can see the diffusive acceleration process in the wide region of the simulation system. The results are a good indication of the validity and the effectiveness of the new model for the multiscale plasma processes.
Kusano Kanya
Sugiyama Takanori
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