PARTICLE ACCELERATION BY STRONG TURBULENCE IN SOLAR FLARES: THEORY OF SPECTRUM EVOLUTION

被引：29
|
作者：
Bykov, A. M. [1 ]
Fleishman, G. D. [1 ,2 ]
机构：
[1] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[2] New Jersey Inst Technol, Newark, NJ 07102 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 692卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
acceleration of particles; diffusion; shock waves; Sun: flares; Sun:; X-rays; gamma rays; turbulence; HARD X-RAY; RECONNECTING CURRENT SHEETS; ELECTRON ACCELERATION; STOCHASTIC ACCELERATION; EMISSION; EVENTS; WAVES; SUPERBUBBLES; TRANSPORT; BURSTS;
D O I：
10.1088/0004-637X/692/1/L45
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We propose a nonlinear self-consistent model of the turbulent nonresonant 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 the back-reaction of the accelerated particles on the turbulence. The main finding is that the nonlinear coupling of accelerated particles with MHD turbulence results 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.
引用
收藏
页码：L45 / L49
页数：5
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