Evolution of Flare-Accelerated Electrons Quantified by Spatially Resolved Analysis
Evolution of Flare-Accelerated Electrons Quantified by Spatially Resolved Analysis
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DOI：
10.3389/fspas.2020.00022
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发表时间：
2020-04
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影响因子：
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通讯作者：
Natsuha Kuroda;G. Fleishman;D. Gary;G. Nita;Bin Chen;Sijie Yu
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作者：
Natsuha Kuroda;G. Fleishman;D. Gary;G. Nita;Bin Chen;Sijie Yu
在太阳耀斑中加速的非热电子产生两个截然不同的、高度互补的电磁发射域——硬x射线（HXRs）和微波（MWs）。本文报告了2017年9月9日发生的M1.2耀斑的扩展欧文斯谷太阳能阵列的MW成像光谱观测结果，从中我们推断出日冕参数图的演变。我们将这些数据与补充的Reuven Ramaty高能太阳光谱成像仪HXR数据一起分析，以揭示燃烧体中非热电子的空间分辨演化。我们发现，与负责HXR发射的低能部分相比，负责MW发射的非热电子分布的高能部分表现出更突出的演化（以强光谱硬化的形式）。我们发现，所揭示的趋势与单电子种群的演化是一致的，根据一个简化的陷阱加沉淀模型，持续注入/加速非热电子，产生双幂律，破坏能量稳步增加。
Non–thermal electrons accelerated in solar flares produce electromagnetic emission in two distinct, highly complementary domains—hard X-rays (HXRs) and microwaves (MWs). This paper reports MW imaging spectroscopy observations from the Expanded Owens Valley Solar Array of an M1.2 flare that occurred on 2017 September 9, from which we deduce evolving coronal parameter maps. We analyze these data jointly with the complementary Reuven Ramaty High-Energy Solar Spectroscopic Imager HXR data to reveal the spatially-resolved evolution of the non-thermal electrons in the flaring volume. We find that the high-energy portion of the non-thermal electron distribution, responsible for the MW emission, displays a much more prominent evolution (in the form of strong spectral hardening) than the low-energy portion, responsible for the HXR emission. We show that the revealed trends are consistent with a single electron population evolving according to a simplified trap-plus-precipitation model with sustained injection/acceleration of non-thermal electrons, which produces a double-powerlaw with steadily increasing break energy.