On microinstabilities in the foot of high Mach number perpendicular shocks

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Abstract

Microinstabilities excited in the foot of a supercritical perpendicular shock wave are investigated. A two-dimensional full particle simulation with periodic boundary conditions in both directions using the physical ion to electron mass ratio is performed as a proxy for the foot region where incoming and specularly reflected ions overlap. The simulation shows that six types of different instabilities are excited in a time period shorter than ion gyroperiod of the reflected ions. The most dominant instability is the modified two-stream instability, which leads to strong parallel electron heating through a so-called two step instability and to ion phase space holes. Copyright 2006 by the American Geophysical Union.

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Matsukiyo, S., & Scholer, M. (2006). On microinstabilities in the foot of high Mach number perpendicular shocks. Journal of Geophysical Research: Space Physics, 111(6). https://doi.org/10.1029/2005JA011409

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