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arXiv 2402.16679astro-ph.SR
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通过日冕物质抛射的缓慢上升阶段揭示其触发路径

Unveiling the Initiation Route of Coronal Mass Ejections through their Slow Rise Phase

Chen Xing, Guillaume Aulanier, Xin Cheng, Chun Xia, Mingde Ding

备注：
35 pages, 15 figures, accepted for publication in ApJ
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AI总结：

本文通过热磁流体力学模拟揭示了CME触发路径：缓慢上升由HFT重联触发并驱动，随后与环面不稳定性耦合持续，最终由快速磁重联与环面不稳定性耦合引发脉冲加速，表明CME触发是多机制耦合的复杂过程。

摘要：

理解日冕物质抛射（CMEs）的早期演化，尤其是其触发过程，是预报太阳爆发及其引发的灾害性空间天气的关键。尽管已提出多种触发机制，但对CME触发过程的完整理解仍不清晰，该过程在运动学上表现为CME前体在脉冲式加速之前的缓慢上升。本文利用最先进的热磁流体力学模拟，确定了一条完整的CME触发路径，其中多种主流机制依次发生且紧密耦合。缓慢上升首先由发展中的双曲磁通管（HFT）重联触发并驱动。随后，缓慢上升在HFT重联与环面不稳定性早期发展的耦合驱动下持续进行。缓慢上升的结束，即脉冲式加速的开始，由快速磁重联的启动与环面不稳定性耦合所诱发。这些结果揭示，CME触发是一个涉及多种物理机制的复杂过程，因而难以用单一触发机制来解释。

英文摘要：

Understanding the early evolution of coronal mass ejections (CMEs), in particular their initiation, is the key to forecasting solar eruptions and induced disastrous space weather. Although many initiation mechanisms have been proposed, a full understanding of CME initiation, which is identified as a slow rise of CME progenitors in kinematics before the impulsive acceleration, remains elusive. Here, with a state-of-the-art thermal-magnetohydrodynamics simulation, we determine a complete CME initiation route in which multiple mainstream mechanisms occur in sequence yet are tightly coupled. The slow rise is first triggered and driven by the developing hyperbolic flux tube (HFT) reconnection. Subsequently, the slow rise continues as driven by the coupling of the HFT reconnection and the early development of torus instability. The end of the slow rise, i.e., the onset of the impulsive acceleration, is induced by the start of the fast magnetic reconnection coupled with the torus instability. These results unveil that the CME initiation is a complicated process involving multiple physical mechanisms, thus being hardly resolved by a single initiation mechanism.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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