Particle acceleration by strong turbulence in solar flares: theory of spectrum evolution

Abstract

We propose a nonlinear self-consistent model of the turbulent non-resonant particle acceleration in solar flares. We simulate temporal evolution of the spectra of charged particles accelerated by strong long-wavelength MHD turbulence taking into account back reaction of the accelerated particles on the turbulence. The main finding is that the nonlinear coupling of accelerated particles and MHD turbulence result in prominent evolution of the spectra of accelerated particles, which can be either soft-hard-soft or soft-hard-harder depending on the particle injection efficiency. Such evolution patterns are widely observed in hard X-ray and gamma-ray emission from solar flares.

arXiv commentApJL in press

References in corpus (12)

• Impulsive phase flare energy transport by large-scale Alfven waves and the electron acceleration problem
• The spectral evolution of impulsive solar X-ray flares
• Relations between concurrent hard X-ray sources in solar flares
• Particle acceleration mechanisms
• Radio Spectral Evolution of an X-ray Poor Impulsive Solar Flare: Implications for Plasma Heating and Electron Acceleration
• Electron Acceleration in Solar Flares: Theory of Spectral Evolution
• Spectral Hardening of Large Solar Flares
• Particle Acceleration by Fast Modes in Solar Flares
• The spectral evolution of impulsive solar X-ray flares. II.Comparison of observations with models
• Stochastic Acceleration of Low Energy Electrons in Plasmas with Finite Temperature
• Spatial Evidence for Transition Radiation in a Solar Radio Burst
• RHESSI Results -- Time For a Rethink?

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