The effect of initial conditions on the electromagnetic radiation generation in type III solar radio bursts

TL;DR

This study uses particle-in-cell simulations to explore how initial conditions influence electromagnetic wave generation in type III solar radio bursts, focusing on the excitation of electromagnetic modes by electron beams in decreasing density plasma.

Contribution

It demonstrates that electromagnetic modes are excited by transverse currents without further beam-plasma interactions, providing insights into wave generation mechanisms in solar radio bursts.

Findings

Electromagnetic L and R modes are excited by initial transverse currents.

No additional interaction between electron beams and plasma observed during simulations.

Initial conditions significantly influence wave excitation in the plasma.

Abstract

Extensive particle-in-cell simulations of fast electron beams injected in a background magnetised plasma with a decreasing density profile were carried out. These simulations were intended to further shed light on a newly proposed mechanism for the generation of electromagnetic waves in type III solar radio bursts [D. Tsiklauri, Phys. Plasmas, 18, 052903 (2011)]. The numerical simulations were carried out using different density profiles and fast electron distribution functions. It is shown that electromagnetic L and R modes are excited by the transverse current, initially imposed on the system. In the course of the simulations no further interaction of the electron beam with the background plasma could be observed.