arXiv 1812.094742018-12astro-ph.SRastro-ph.HEphysics.plasm-ph

利用太阳耀斑硬X射线谱确定总加速电子速率和功率

Determination of the total accelerated electron rate and power using solar flare hard X-ray spectra

Eduard P. Kontar, Natasha L. S. Jeffrey, A. Gordon Emslie

备注：: Accepted for publication in the Astrophysical Journal, 18 pages, 5 figures
DOI：: 10.3847/1538-4357/aafad3

摘要：

太阳耀斑硬X射线光谱学是加速电子光谱的关键诊断。然而，使用碰撞冷厚靶模型的标准方法对加速电子谱的较低能量部分的约束很差，因此加速电子的总体能量通常仅被约束在一个或两个数量级内。在这里，我们开发和应用一个物理上自洽的温暖的目标的方法，涉及到使用硬X射线光谱和成像数据。该方法允许一个准确的确定的电子分布低能量截止，因此，电子加速率和加速的电子释放的总能量的贡献，通过约束的日冕等离子体参数。利用{ \em RHESSI}航天器在X射线中观测到的太阳耀斑，我们证明了使用标准冷靶方法，低能截止（因此电子中的能量含量）基本上是不确定的。然而，热靶方法可以确定与$\sim$ 7\%的不确定度在$3σ$水平的低能电子截止，因此允许一个精确的定量研究加速电子的重要性，在太阳耀斑能量学。

英文摘要：

Solar flare hard X-ray spectroscopy serves as a key diagnostic of the accelerated electron spectrum. However, the standard approach using the collisional cold thick-target model poorly constrains the lower-energy part of the accelerated electron spectrum, and hence the overall energetics of the accelerated electrons are typically constrained only to within one or two orders of magnitude. Here we develop and apply a physically self-consistent warm-target approach which involves the use of both hard X-ray spectroscopy and imaging data. The approach allows an accurate determination of the electron distribution low-energy cutoff, and hence the electron acceleration rate and the contribution of accelerated electrons to the total energy released, by constraining the coronal plasma parameters. Using a solar flare observed in X-rays by the {\em RHESSI} spacecraft, we demonstrate that using the standard cold-target methodology, the low-energy cutoff (and hence the energy content in electrons) is essentially undetermined. However, the warm-target methodology can determine the low-energy electron cutoff with $\sim$7\% uncertainty at the $3σ$ level and hence permits an accurate quantitative study of the importance of accelerated electrons in solar flare energetics.

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