Plasma radio emission from inhomogeneous collisional plasma of a flaring loop

Abstract

The evolution of a solar flare accelerated non-thermal electron population and associated plasma emission is considered in collisional inhomogeneous plasma. Non-thermal electrons collisionally evolve to become unstable and generate Langmuir waves, which may lead to intense radio emission. We self-consistently simulated the collisional relaxation of electrons, wave-particle interactions, and non-linear Langmuir wave evolution in plasma with density fluctuations. Additionally, we simulated the scattering, decay, and coalescence of the Langmuir waves which produce radio emission at the fundamental or the harmonic of the plasma frequency, using an angle-averaged emission model. Long-wavelength density fluctuations, such as are observed in the corona, are seen to strongly suppress the levels of radio emission, meaning that a high level of Langmuir waves can be present without visible radio emission. Additionally, in homogeneous plasma, the emission shows time and frequency variations that could be smoothed out by density inhomogeneities.

References in corpus (2)

• Nonlinear development of electron-beam-driven weak turbulence in an inhomogeneous plasma
• An alternative to the plasma emission model: Particle-In-Cell, self-consistent electromagnetic wave emission simulations of solar type III radio bursts

Cited by in corpus (12)

• A Review of Solar Type III Radio Bursts
• Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
• Anisotropic Radio-Wave Scattering and the Interpretation of Solar Radio Emission Observations
• Large scale simulations of solar type III radio bursts: flux density, drift rate, duration and bandwidth
• The origin of the modulation of the radio emission from the solar corona by a fast magnetoacoustic wave
• Solar type III radio burst time characteristics at LOFAR frequencies and the implications for electron beam transport
• Stopping Frequency of Type III Solar Radio Bursts in Expanding Magnetic Flux Tubes
• An alternative form of the fundamental plasma emission through the coalescence of Z-mode waves with whistlers
• Bridging High-Density, Electron Beam Coronal Transport and Deep Chromospheric Heating in Stellar Flares
• Collisional damping rates for plasma waves
• Solar plasma radio emission in the presence of imbalanced turbulence of kinetic-scale Alfvén waves
• Radiative Signatures of Magnetic Reconnection: An Approach to Remote Probing of Reconnection Dynamics