Drift-Kinetic Modeling of Particle Acceleration and Transport in Solar Flares

Abstract

Based on the drift-kinetic theory, we develop a model for particle acceleration and transport in solar flares. The model describes the evolution of the particle distribution function by means of a numerical simulation of the drift-kinetic Vlasov equation, which allows us to directly compare simulation results with observations within an actual parameter range of the solar corona. Using this model, we investigate the time evolution of the electron distribution in a flaring region. The simulation identifies two dominant mechanisms of electron acceleration. One is the betatron acceleration at the top of closed loops, which enhances the electron velocity perpendicular to the magnetic field line. The other is the inertia drift acceleration in open magnetic field lines, which produces antisunward electrons. The resulting velocity space distribution significantly deviates from an isotropic distribution. The former acceleration can be a generation mechanism of electrons that radiate loop-top nonthermal emissions, and the latter be of escaping electrons from the Sun that should be observed by in-situ measurements in interplanetary space and resulting radio bursts through plasma instabilities.

32 Pages, 11 figures, accepted by ApJ

References in corpus (4)

• Comparative Analysis of Non-thermal Emissions and Study of Electron Transport in a Solar Flare
• On the Brightness and Waiting-time Distributions of a Type III Radio Storm observed by STEREO/WAVES
• The Spatial Distribution of Hard X-Ray Spectral Index and Local Magnetic Reconnection Rate
• Multi-Wavelength Observation of Electron Acceleration in the 2006 December 13 Flare

Cited by in corpus (8)

• A Systematic Examination of Particle Motion in a Collapsing Magnetic Trap Model for Solar Flares
• Coronal Electron Distribution in Solar Flares: Drift-Kinetic Model
• Particle Acceleration in Collapsing Magnetic Traps with a Braking Plasma Jet
• Loss cone evolution and particle escape in collapsing magnetic trap models in solar flares
• Particle energisation in a collapsing magnetic trap model: the relativistic regime
• Particle acceleration with anomalous pitch angle scattering in 3D separator reconnection
• Stochastic Electron Acceleration by Temperature Anisotropy Instabilities Under Solar Flare Plasma Conditions
• Temporal and Spatial Characteristics of Hard X-Ray Sources in Flare Model with a Vertical Current Sheet