Electron-beam instabilities in the foreshock of high Mach number oblique shocks
July 05, 2021
Motivated by simulations of non-relativistic high-Mach-number shocks in supernova remnants, we investigate the instabilities excited by relativistic electron beams in the extended foreshock of oblique shocks. The phase-space distributions in the near and far upstream of the PIC simulation of a shock are used as initial conditions for simulations with periodic boundary conditions to study their relaxation towards equilibrium. We find that the observed electron-beam instabilities agree very well with the predictions of a linear dispersion analysis: the electrostatic electron-acoustic instability dominates in the far upstream of the foreshock, while the denser electron beams in the near upstream drive the gyroresonant oblique-whistler instability.
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