10:45 AM - 11:00 AM
[PEM19-01] Microinstabilities in a supercritical perpendicular shock revisited
Keywords:collisionless shock, microinstability, numerical simulation
In this study microinstabilities in the foot of a supercritical perpendicular shock is revisited. We perform a number of local simulations representing a part of the foot region with systematically changing the two ratios, mass ratio and frequency ratio, by using two-dimensional full particle-in-cell code. The foot plasma is assumed to be consist of incoming ions, electrons, and reflected ions. The system size is smaller than ion gyro radius in X, which is parallel to the shock normal, and a few times ion inertial length in Y, which is along a shock surface and the ambient magnetic field. The boundary conditions are periodic in both directions. We will report the results of the simulations in which the mass ratio and the frequency ratio are systematically varied with fixing the local Alfven Mach number, plasma beta, and relative density of the reflected ions.