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arXiv 0907.1874astro-ph.SRastro-ph.HE
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太阳耀斑中的元能释放事件

Elementary Energy Release Events in Solar Flares

Siming Liu, Lyndsay Fletcher

摘要:

大多数对太阳耀斑期间粒子加速的理论研究不能应用于观测,以详细研究时间演化。我们提出了一个湍流演化和随机粒子加速的唯象模型,通过两个系数表征粒子与湍流电磁场的相互作用,将观测与能量释放和粒子加速联系起来。在线性区域,颗粒分布不影响湍流能量级联。结果表明,电子加速关键取决于小尺度湍流的强度和脉冲的非热分量只出现在附近的逐渐演变的湍流强度的峰值。该模型自然地再现了硬X射线脉冲的软-硬-软模式,我们将观测到的通量和光谱指数相关性的变化归因于背景等离子体中的变化,这些变化是从某些脉冲的上升到衰减阶段。对观测良好的单个事件进行详细建模将探测能量释放过程。

英文摘要:

Most theoretical investigations of particle acceleration during solar flares cannot be applied to observations for detailed study of the time evolution. We propose a phenomenological model for turbulence evolution and stochastic particle acceleration that links observations to the energy release and particle acceleration through two coefficients characterizing particle interactions with turbulent electromagnetic fields. In the linear regime the particle distribution does not affect the turbulence energy cascade. It is shown that electron acceleration critically depends on the intensity of small-scale turbulence and an impulsive non-thermal component only appears near the peak of the gradually evolving turbulence intensity. The model naturally reproduces the soft-hard-soft pattern of hard X-ray pulses, and we attribute the observed change in flux and spectral index correlation from the rise to decay phase of some pulses to changes in the background plasma. Detailed modeling of well-observed individual events will probe the energy release processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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