Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10th Solar Flare
Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10th Solar Flare
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DOI：
10.3847/1538-4357/ac6efe
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Xiaocan Li;F. Guo;Bin Chen;Chengcai Shen;L. Glesener
中科院分区：
文献类型：
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作者：
Xiaocan Li;F. Guo;Bin Chen;Chengcai Shen;L. Glesener
2017年9月10日的X8.2级耀斑是研究最充分的耀斑事件之一，因为它与标准耀斑模型非常相似，而且多个航天器和地面观测都覆盖了广泛的范围。这些多波长观测表明，在重联和耀斑环顶区域，电子的加速和输运是有效的。然而，缺乏一个全面的模型来解释和解释这些多方面的观察结果。在这项工作中，我们模拟了这种耀斑早期脉冲阶段的电子加速和输运。我们用MHD模拟了大尺度耀斑区的Parker输运方程，该方程包含了磁重联过程中的主要加速机制。我们发现，电子被加速到几个MeV，并填充了大量的重联区，类似于微波中的观测结果。环顶区域的电子空间分布和光谱形状与磁岛变大并主导加速之前的微波和硬X射线发射所得的结果很好地吻合。未来使用电子地图的发射建模将能够与微波和硬X射线观测进行直接比较。这些结果揭示了在数据受限的真实耀斑几何图形中，电子在大范围太阳耀斑中的加速和传输。
The X8.2-class limb flare on 2017 September 10 is among the best studied solar flare events owing to its great similarity to the standard flare model and the broad coverage by multiple spacecraft and ground-based observations. These multiwavelength observations indicate that electron acceleration and transport are efficient in the reconnection and flare looptop regions. However, there lacks a comprehensive model for explaining and interpreting the multi-faceted observations. In this work, we model the electron acceleration and transport in the early impulsive phase of this flare. We solve the Parker transport equation that includes the primary acceleration mechanism during magnetic reconnection in the large-scale flare region modeled by MHD simulations. We find that electrons are accelerated up to several MeV and fill a large volume of the reconnection region, similar to the observations shown in microwaves. The electron spatial distribution and spectral shape in the looptop region agree well with those derived from the microwave and hard X-ray emissions before magnetic islands grow large and dominate the acceleration. Future emission modelings using the electron maps will enable direct comparison with microwave and hard X-ray observations. These results shed new light on the electron acceleration and transport in a broad region of solar flares within a data-constrained realistic flare geometry.