Particle simulation of electromagnetic emissions from electrostatic instability driven by an electron ring beam on the density gradient

Abstract

This paper presents the wave mode conversion between electrostatic and electromagnetic waves on the plasma density gradient. We use 2-D electromagnetic code KEMPO2 implemented with the generation of density gradient to simulate such a conversion process. In the dense region, we use ring beam instability to generate electron Bernstein waves and we study the temporal evolution of wave spectra, velocity distributions, Poynting flux, and electric and magnetic energies to observe the wave mode conversion. Such a conversion process can be a source of electromagnetic emissions which are routinely measured by spacecraft on the plasmapause density gradient.

PIC simulations of microinstabilities and waves at near-Sun solar wind perpendicular shocks: Predictions for Parker Solar Probe and Solar Orbiter

“…around 1 au. They are commonly believed to accelerate electrons and provide possible free energy sources of EM emissions at shocks, magnetopause, and solar flares (Graham et al 2018;Horký et al 2018;Henri et al 2019). Despite this, there is a lack of in situ observations accurately of determining shock microstructures and associated plasma waves excited in the near-Sun solar wind.…”