Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1168s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1168
Physics
7807 Charged Particle Motion And Acceleration, 7843 Numerical Simulation Studies, 7851 Shock Waves, 7867 Wave/Particle Interactions
Scientific paper
We have performed hybrid simulations to investigate the injection process at quasi-perpendicular shocks. The simulations are performed in one-dimensional system, therefore the injection is done without cross-field diffusion. For detailed investigations of the low density of the back-streaming ions which run into further upstream region (over Lamor radius), we have used over 10 thousand particles in simulation cell. This enable us to analyze the contribution of the reflected ions to the excitation of the upstream wave. The growth rate of the wave is smaller than the case in quasi-parallel shocks, but has finite value both in the oblique propagation angle and in a low density cases less than 0.1 percent of the incoming upstream thermal ions. We have observed the wave excitation by the reflected ions even in quasi-perpendicular shocks. This wave is different from the dispersive Whistler wave. This wave can boost up the ion reflection at the shock surface after convected from the upstream region to the shock surface.
Fujimoto Minoru
Sugiyama Takanori
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