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arXiv 2302.11232astro-ph.SR
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爆发性C7耀斑中能量释放和脉冲CME动力学的多点研究

Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare

J. Saqri, A. M. Veronig, E. C. M. Dickson, T. Podladchikova, A. Warmuth, H. Xiao, D. E. Gary, A. F. Battaglia, S. Krucker

摘要:

我们结合了来自不同有利位置的观测,对2021年4月17日发生的长时间爆发性C7级耀斑进行了详细研究,该耀斑从地球视图中被部分掩盖。的动力学和热性质的耀斑相关的等离子体流,耀斑拱廊,和能量释放和粒子加速一起研究与相关的日冕物质抛射的运动学演化,以便把这个长时间的事件在以前的爆发性耀斑研究的背景下。耀斑显示出硬X射线(HXR)爆发持续了一个小时,从16:04 UT持续到17:05 UT。在第一阶段,从热等离子体和脉冲加速的日冕物质抛射的发射强烈增加。CME加速剖面显示了与第一个STIX HXR爆发阶段一致的缓慢上升,加速和传播的三部分演变,该阶段由上升的热(14 MK)等离子体团触发。在CME加速阶段,我们发现正在进行的磁重联背后的喷发结构的签名,与标准的喷发耀斑的情况。随后的HXR爆发发生在主CME加速后约30分钟,表现出光谱硬化(从$δ\approx $ 7到$δ\approx $ 4),但不对应于进一步的CME加速和色球蒸发。因此,日冕物质抛射-耀斑反馈关系可能只在研究中的事件的前25分钟内具有重要意义,因为此后耀斑和日冕物质抛射喷发相互独立地发展。

英文摘要:

We combine observations from different vantage points to perform a detailed study of a long duration eruptive C7 class flare that occurred on 17 April 2021 and was partially occulted from Earth view. The dynamics and thermal properties of the flare-related plasma flows, the flaring arcade, and the energy releases and particle acceleration are studied together with the kinematic evolution of the associated CME in order to place this long duration event in context of previous eruptive flare studies. The flare showed hard X-ray (HXR) bursts over the duration of an hour in two phases lasting from 16:04 UT to 17:05 UT. During the first phase, a strong increase in emission from hot plasma and impulsive acceleration of the CME was observed. The CME acceleration profile shows a three-part evolution of slow rise, acceleration, and propagation in line with the first STIX HXR burst phase, which is triggered by a rising hot (14 MK) plasmoid. During the CME acceleration phase, we find signatures of ongoing magnetic reconnection behind the erupting structure, in agreement with the standard eruptive flare scenario. The subsequent HXR bursts that occur about 30 minutes after the primary CME acceleration show a spectral hardening (from $δ\approx $ 7 to $δ\approx $ 4) but do not correspond to further CME acceleration and chromospheric evaporation. Therefore, the CME-flare feedback relationship may only be of significance within the first 25 minutes of the event under study, as thereafter the flare and the CME eruption evolve independently of each other.

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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