论文标题
宏观磁重新连接期间的电子加速度
Electron Acceleration during Macroscale Magnetic Reconnection
论文作者
论文摘要
介绍了在宏观系统中磁重新连接期间电子加速度的第一个自洽模拟。与太阳耀斑观测一致的能量电子的光谱采用了延伸二十年以上能量的幂律形式。这些非热电子的驱动机制是在生长和合并磁通绳的费米反射。发现强大的指导场通过削弱费米驱动机制来抑制非热电子的产生。对于弱导向场，非热电子的总能量含量即使它们的数量密度仍然很小，也会主导热热电子的总能量。我们的结果在2017年9月10日对X8.2级太阳耀斑的硬X射线，无线电和极端紫罗兰（EUV）观察结果进行了基准测试。
The first self-consistent simulations of electron acceleration during magnetic reconnection in a macroscale system are presented. Consistent with solar flare observations the spectra of energetic electrons take the form of power-laws that extend more than two decades in energy. The drive mechanism for these nonthermal electrons is Fermi reflection in growing and merging magnetic flux ropes. A strong guide field is found to suppress the production of nonthermal electrons by weakening the Fermi drive mechanism. For a weak guide field the total energy content of nonthermal electrons dominates that of the hot thermal electrons even though their number density remains small. Our results are benchmarked with the hard x-ray, radio and extreme ultra-violet (EUV) observations of the X8.2-class solar flare on September 10, 2017.
