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arXiv 1801.04743astro-ph.SRastro-ph.HEphysics.plasm-phphysics.space-ph
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太阳耀斑中电子的空间非均匀加速

Spatially inhomogeneous acceleration of electrons in solar flares

Duncan J. Stackhouse, Eduard P. Kontar

摘要:

Ramaty高能太阳光谱成像仪(RHESSI)的成像光谱能力使得能够检查整个太阳耀斑区域的加速电子分布。特别是,已经揭示了这些粒子的能量化发生在有限大小的区域上,有时通过RHESSI观测来解决。在本文中,我们提出了,第一次,一个空间分布的加速度模型和调查的作用,非均匀的加速度上观察到的X射线发射特性。我们模拟运输明确检查散射自由和扩散运输的加速区域内,并与分析漏箱解决方案进行比较。结果表明,包括这种空间变化时,电子加速在太阳耀斑建模的重要性。一个不均匀的,扩展的加速度区域的存在下产生的频谱指数,这是在大多数情况下,从简单的漏盒预测不同。特别是,它的结果在一般软的光谱指数比预测的漏箱解决方案,散射和扩散运输,因此应考虑在太阳耀斑的随机加速建模时。

英文摘要:

The imaging spectroscopy capabilities of the Reuven Ramaty high energy solar spectroscopic imager (RHESSI) enable the examination of the accelerated electron distribution throughout a solar flare region. In particular, it has been revealed that the energisation of these particles takes place over a region of finite size, sometimes resolved by RHESSI observations. In this paper, we present, for the first time, a spatially distributed acceleration model and investigate the role of inhomogeneous acceleration on the observed X-ray emission properties. We have modelled transport explicitly examining scatter-free and diffusive transport within the acceleration region and compare with the analytic leaky-box solution. The results show the importance of including this spatial variation when modelling electron acceleration in solar flares. The presence of an inhomogeneous, extended acceleration region produces a spectral index that is, in most cases, different from the simple leaky-box prediction. In particular, it results in a generally softer spectral index than predicted by the leaky-box solution, for both scatter-free and diffusive transport, and thus should be taken into account when modelling stochastic acceleration in solar flares.

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