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28 March 2024
 
  » arxiv » 0901.2677

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Particle acceleration by strong turbulence in solar flares: theory of spectrum evolution
A.M. Bykov ; G.D. Fleishman ;
Date 18 Jan 2009
AbstractWe 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.
Source arXiv, 0901.2677
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