论文标题
在2017年9月10日太阳耀斑的早期冲动阶段对电子加速和运输进行建模
Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10 Solar Flare
论文作者
论文摘要
2017年9月10日，X8.2级的肢体耀斑是研究最佳的太阳耀斑事件之一，因为它与标准耀斑模型的相似之处以及多个航天器和基于地面的观测值的广泛覆盖范围。这些多波长的观察结果表明，电子加速度和运输在重新连接和耀斑循环区域中是有效的。但是，缺乏用于解释和解释多方面观察结果的全面模型。在这项工作中，我们在这种耀斑的早期冲动阶段对电子加速度和运输进行建模。我们解决了帕克传输方程，其中包括通过MHD模拟建模的大规模耀斑区域中磁重新连接期间的主要加速机制。我们发现电子被加速至几种MEV，并填充了大量的重新连接区域，类似于微波炉中所示的观测值。循环区域中的电子空间分布和光谱形状与磁岛之前的微波炉和硬X射线排放衍生出的频谱形状非常吻合。使用电子图的未来发射模型将与微波和硬X射线观测直接进行比较。这些结果为在数据约束的逼真的耀斑几何形状内的宽太阳耀斑区域中的电子加速度和运输提供了新的启示。
The X8.2-class limb flare on September 10, 2017 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.
