Recent Advances in Understanding Particle Acceleration Processes in Solar Flares
Recent Advances in Understanding Particle Acceleration Processes in Solar Flares
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DOI：
10.1007/s11214-011-9803-y
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发表时间：
2011-07
影响因子：
10.3
通讯作者：
V. Zharkova;K. Arzner;A. Benz;P. Browning;C. Dauphin;A. Emslie;L. Fletcher;E. P. Kontar;
中科院分区：
文献类型：
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作者：
V. Zharkova;K. Arzner;A. Benz;P. Browning;C. Dauphin;A. Emslie;L. Fletcher;E. P. Kontar;
我们回顾了粒子加速的基本理论概念，特别强调了可能发生在磁重联区域的过程。讨论了几个新的发展，包括详细研究了三维磁场构型(如电流片、坍塌陷阱、分离线区域)中的重联和湍流环境中的随机加速。使用流体方法、测试粒子方法和细胞内粒子方法，并对结果进行比较。虽然这些研究在解释太阳耀斑的各种观测表现方面有相当大的希望，但它们受到一些因素的限制，主要与可用的计算能力有关。这些问题中最重要的是需要明确地将加速粒子本身的电动力学反馈纳入到它们被加速的环境中。对未来的发展进行了简要的预测。
We review basic theoretical concepts in particle acceleration, with particular emphasis on processes likely to occur in regions of magnetic reconnection. Several new developments are discussed, including detailed studies of reconnection in three-dimensional magnetic field configurations (e.g., current sheets, collapsing traps, separatrix regions) and stochastic acceleration in a turbulent environment. Fluid, test-particle, and particle-in-cell approaches are used and results compared. While these studies show considerable promise in accounting for the various observational manifestations of solar flares, they are limited by a number of factors, mostly relating to available computational power. Not the least of these issues is the need to explicitly incorporate the electrodynamic feedback of the accelerated particles themselves on the environment in which they are accelerated. A brief prognosis for future advancement is offered.