The Source Locations of Major Flares and CMEs in the Emerging Active Regions
The Source Locations of Major Flares and CMEs in the Emerging Active Regions
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新兴活动区主要耀斑和日冕物质抛射的源位置
DOI：
10.5194/egusphere-egu21-31
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Jun Cui
中科院分区：
文献类型：
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作者：
Lijuan Liu;Yuming Wang;Zhenjun Zhou;Jun Cui
主要耀斑和日冕物质抛射（CME）往往源自太阳活动区（AR）中的致密极性反转线（PIL）。最近，\citet{Chintzoglou_2019} 提出了一种名为“碰撞剪切”的场景来解释这种现象，这表明不同新兴双极之间的碰撞能够形成紧凑的 PIL，驱动剪切和通量抵消，从而导致后续的大型活动。在这项工作中，通过跟踪19个新兴AR从诞生到产生第一个主要耀斑或CME的演化过程，我们研究了活动的源PIL，即活跃的PIL，以探索“碰撞剪切”的普遍性。我们发现没有一个活性 PIL 是单个双极子的自 PIL (sPIL)。我们进一步发现，11 次喷发源于不同双极之间碰撞形成的碰撞 PIL（cPIL），6 次来自 sPIL 和 cPIL 联合系统，2 次来自 sPIL 和 ePIL 联合系统（AR 和附近预先存在的极性之间的外部 PIL）。发现在喷发前所有 PIL 都发生了伴随着剪切和通量抵消的碰撞，其中 $84\%$ (16/19) 案例的碰撞长度超过 18~Mm。此外，我们发现耀斑的强度与活跃PIL的碰撞长度呈正相关，这表明更强烈的活动往往源自碰撞更严重的PIL。结果表明，“碰撞剪切”，即通量出现过程中的双极-双极相互作用，是驱动新兴 AR 中主要活动的常见过程。
Major flares and coronal mass ejections (CMEs) tend to originate from the compact polarity inversion lines (PILs) in the solar active regions (ARs). Recently, a scenario named as "collisional shearing" is proposed by \citet{Chintzoglou_2019} to explain the phenomenon, which suggests that the collision between different emerging bipoles is able to form the compact PIL, driving the shearing and flux cancellation that are responsible to the subsequent large activities. In this work, through tracking the evolution of 19 emerging ARs from their birth until they produce the first major flares or CMEs, we investigated the source PILs of the activities, i.e., the active PILs, to explore the generality of "collisional shearing". We find that none of the active PILs is the self PIL (sPIL) of a single bipole. We further find that 11 eruptions originate from the collisional PILs (cPILs) formed due to the collision between different bipoles, 6 from the conjoined systems of sPIL and cPIL, and 2 from the conjoined systems of sPIL and ePIL (external PIL between the AR and the nearby preexisting polarities). Collision accompanied by shearing and flux cancellation is found developing at all PILs prior to the eruptions, with $84\%$ (16/19) cases having collisional length longer than 18~Mm. Moreover, we find that the magnitude of the flares is positively correlated with the collisional length of the active PILs, indicating that the intenser activities tend to originate from the PILs with severer collision. The results suggest that the "collisional shearing", i.e., bipole-bipole interaction during the flux emergence is a common process in driving the major activities in emerging ARs.