HR: 11:35h
AN: SH52A-05    [Abstracts]
TI: 2D PIC simulation on microinstabilities in the foot of high Mach number quasi-perpendicular shocks
AU: * Matsukiyo, S
EM: matsukiy@esst.kyushu-u.ac.jp
AF: ESST. Kyushu University, 6-1 Kasuga Koen, Kasuga, 816-8580 Japan
AU: Scholer, M
EM: scholer@mpe.mpg.de
AF: Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse, Garching, 85748 Germany
AB: High Mach number shocks in space and astrophysical plasmas have been extensively studied, both observationally and theoretically, since it is a mine of various kinds of wave activities and mechanisms of particle accleration/heating. In particular, recent full particle simulation studies revealed that a variety of microinstabilities, for instance the Buneman instability, the electron cyclotron drift instability, the modified two-stream instability, etc., are generated in the foot of low beta supercritical quasi-perpendicular shocks. Since each instability has different propagation angle with respect to the ambient magnetic field, multi-dimensionality is important to discuss all instabilies simultaneously. In this study, a 2D PIC (particle-in-cell) simulation with periodic boundary conditions in both directions is performed as a proxy for the foot region which includes incoming and reflected ions, and electrons. The simulation shows that six types of different instabilities are excited in a time period shorter than ion gyro period of the reflected ions. The most dominant instability is the modified two-stream instability, which leads to strong electron heating through a so-called two step instability. Influences of the modified two-stream instability to shock stationarity are also discussed.
DE: 7514 Energetic particles (2114)
DE: 7846 Plasma energization
DE: 7851 Shock waves (4455)
DE: 7867 Wave/particle interactions (2483, 6984)
DE: 7868 Wave/wave interactions
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005