发表机构
School of Astronomy and Space Science, Nanjing University; Key Laboratory for Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education; Institute of Science and Technology for Deep Space Exploration, Suzhou Campus, Nanjing University; State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology（南京大学天文与空间科学学院; 教育部现代天文学和天体物理学重点实验室（南京大学）; 南京大学苏州校区深空探测科学与技术研究院; 澳门科技大学月球与行星科学国家重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过高分辨率MHD模拟，发现太阳耀斑的湍流重联可快速加速电子至约90keV，加速由湍流驱动压缩结构实现，为高能粒子加速机制提供了新见解。
AI 中文摘要
太阳耀斑可在日冕中爆炸性释放磁能，并在短时间内产生高能粒子，但这些粒子的加速方式与发生位置仍是待解问题。本研究在高分辨率MHD模拟框架下，通过求解Parker输运方程，探究太阳耀斑自发展三维湍流重联过程中电子的加速与输运。研究发现，耀斑电流片和环顶处的热电子均被快速加速至约90keV，其能谱呈现幂律特征；尽管耀斑环顶处加速电子的数量多于电流片处，但两者的谱指数相近，接近观测到的典型值。更重要的是，该加速由不同尺度的湍流驱动压缩结构实现，而非此前假设的终止激波，尤其在耀斑环顶处，部分压缩结构甚至会形成激波。这些结果凸显了湍流重联在电子加速中的关键作用，为理解其他高能现象中粒子的加速与输运提供了新视角。
英文摘要
Solar flares can release magnetic energy explosively in the corona and produce high-energy particles on short timescales. However, how and where these particles are accelerated remains an open question. Here, we investigate the acceleration and transport of electrons during self-developed three-dimensional turbulent reconnection of solar flares by solving Parker's transport equation in the framework of high-resolution MHD simulations. We find that thermal electrons at both the flare current sheet and loop top are rapidly accelerated up to ~90keV, with energy spectra exhibiting a power-law feature. Although the population of accelerated electrons at the flare loop top is larger than that at the current sheet, their spectral indices are similar, close to the values usually observed. More importantly, the acceleration is achieved by turbulence-driven compression structures of various scales rather than the supposed termination shock, particularly at the flare loop top. A portion of compression structures even forms shocks. These results highlight the critical role of turbulent reconnection in accelerating electrons, thereby shedding new light on the acceleration and transport of particles in other high-energy phenomena.
Comments13 pages, 9 figures; Accepted for publication in ApJ
