Emission of Type II Radio Bursts - Single-Beam versus Two-Beam Scenario

Abstract

The foreshock region of a CME shock front, where shock accelerated electrons form a beam population in the otherwise quiescent plasma is generally assumed to be the source region of type II radio bursts. Nonlinear wave interaction of electrostatic waves excited by the beamed electrons are the prime candidates for the radio waves' emission. To address the question whether a single, or two counterpropagating beam populations are a requirement for this process, we have conducted 2.5D particle in cell simulations using the fully relativistic ACRONYM code. Results show indications of three wave interaction leading to electromagnetic emission at the fundamental and harmonic frequency for the two-beam case. For the single-beam case, no such signatures were detectable.

arXiv comment11 pages, 9 figures, accepted in Solar Physics topical Issue "Advances in European Solar Physics"

References in corpus (2)

• Structure on Interplanetary Shock Fronts: Type II Radio Burst Source Regions
• An alternative to the plasma emission model: Particle-In-Cell, self-consistent electromagnetic wave emission simulations of solar type III radio bursts

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• Possible role of coronal streamer as magnetically-closed structure in shock-induced energetic electrons and metric type II radio bursts
• The Interplay of the Solar Wind Core and Suprathermal Electrons: A Quasilinear Approach for Firehose Instability
• A comparison of weak-turbulence and PIC simulations of weak electron-beam plasma interaction
• Wave excitation by energetic ring-distributed electron beams in the solar corona
• Simulation of plasma emission in magnetized plasmas
• Verification of the standard theory of plasma emission with particle-in-cell simulations
• Fundamental and harmonic plasma emission in different plasma environments
• Electromagnetic Emission Produced by Three-wave Interactions in a Plasma with Continiously Injected Counterstreaming Electron Beams
• The effects of density inhomogeneities on the radio wave emission in electron beam plasmas
• The aperiodic firehose instability of counter-beaming electrons in space plasmas
• Plasma emission induced by ring-distributed energetic electrons in overdense plasmas
• Formation of Isolated Radio Type II Bursts at Low Frequencies
• Nonthermal electron velocity distribution functions due to 3D kinetic magnetic reconnection for solar coronal plasma conditions
• Numerical simulations of a continuously injected relativistic electron beam relaxation into a plasma with large-scale density gradients
• Extended scenarios for solar radio emissions with downshifted electron beam plasma excitations
• Source location and evolution of a multi-lane type II radio burst