Fundamental and harmonic plasma emission in different plasma environments

Abstract

Aims: Emission of radio waves from plasmas through plasma emission with fundamental and harmonic frequencies is a familiar process known from solar type II radio bursts. Current models assume the existence of counterstreaming electron beam populations excited at shocks as sources for these emission features, which limits the plasma parameters to reasonable heliospheric shock conditions. However, situations in which counterstreaming electron beams are present can also occur with different plasma parameters, such as higher magnetisation, including but not limited to our Sun. Similar radio emissions might also occur from these situations. Methods: We used particle-in-cell simulations, to compare plasma microphysics of radio emission processes from counterstreaming beams in different plasma environments that differed in density and magnetization. Results: Although large differences in wave populations are evident, the emission process of type II bursts appears to be qualitatively unaffected and shows the same behaviour in all environments.

arXiv comment5 Pages, accepted for publication in Astronomy & Astrophysics

References in corpus (5)

• Emission of Type II Radio Bursts - Single-Beam versus Two-Beam Scenario
• Ultra-high-time Resolution Observations of Radio Bursts on AD Leonis
• Structure on Interplanetary Shock Fronts: Type II Radio Burst Source Regions
• Nonlinear Wave Interactions as Emission Process of Type II Radio Bursts
• Three-wave interactions of dispersive plasma waves propagating parallel to the magnetic field

Cited by in corpus (5)

• Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms
• Possible role of coronal streamer as magnetically-closed structure in shock-induced energetic electrons and metric type II radio bursts
• A new hybrid code (CHIEF) implementing the inertial electron fluid equation without approximation
• Electromagnetic Emission Produced by Three-wave Interactions in a Plasma with Continiously Injected Counterstreaming Electron Beams
• Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle