External reconnection and resultant reconfiguration of overlying magnetic fields during sympathetic eruptions of two filaments
External reconnection and resultant reconfiguration of overlying magnetic fields during sympathetic eruptions of two filaments
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两根细丝交感爆发期间的外部重连接和由此产生的上覆磁场的重新配置
DOI：
10.1051/0004-6361/202038348
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发表时间：
2020-06
影响因子：
6.5
通讯作者：
Zhang J.
中科院分区：
文献类型：
--
作者：
Hou Y. J.;Li T.;Song Z. P.;Zhang J.
上下文人们对两个太阳暗条的交感喷发已经研究了几十年，但一个喷发的暗条触发另一个喷发的详细物理过程仍在争论中。在这里，我们的目标是研究交感神经事件的物理性质，涉及2015年11月15日至16日连续爆发的两个细丝，提出了丰富的交感神经特征。结合太阳动力学观测站和其他观测站的观测资料以及非线性无力场（NLFFF）外推的结果，研究了交感事件期间观测特征和磁场拓扑结构的演化。两个暗条（北F1和南F2）被一个狭窄的负极性区域分开，F1首先爆发，产生了一个双带耀斑。当由F1产生的向外扩展的带状物接近稳定的F2时，在F2的南部观察到一个弱的增亮，然后向北扩展，向内接近F2。在这种向内扩散的增亮背后，一个以等离子体密度降低30%为特征的变暗区域正在延伸。NLFFF外推的时间序列显示，以上的爆发前F1和F2的领域构成了一个四极磁系统与一个可能的零点。此外，零点继续向F2移动，并在随后的几个小时内下降。我们推断，上升的F1将其上覆场推向稳定的F2之上的场，并导致上覆场之间连续的外部重联。从外到内（高度越来越低），喷发前F2上方的场逐渐参与重联，表现为F2南侧的增亮和增暗向内扩展。此外，外部重联可以通过将磁通量从F2的西部输送到东部来重新配置F2的上覆场，这一点在F2随后的部分喷发中得到了进一步的证实。我们提出了一个综合的证据链，以证明外部磁场重联的关键作用，并由此重新配置的叠加场上的交感神经爆发的两个灯丝。
Context. Sympathetic eruptions of two solar filaments have been studied for several decades, but the detailed physical process through which one erupting filament triggers another is still under debate.Aims. Here we aim to investigate the physical nature of a sympathetic event involving successive eruptions of two filaments on 2015 November 15-16, which presented abundant sympathetic characteristics.Methods. Combining data from the Solar Dynamics Observatory and other observatories as well as results of nonlinear force-free field (NLFFF) extrapolations, we study the evolution of observational features and magnetic topology during the sympathetic event.Results. The two filaments (north F1 and south F2) were separated by a narrow region of negative polarity, and F1 first erupted, producing a two-ribbon flare. When the outward-spreading ribbon produced by F1 approached stable F2, a weak brightening was observed to the south of F2 and then spread northward, inward approaching F2. Behind this inward-spreading brightening, a dimming region characterized by a plasma density reduction of 30% was extending. NLFFF extrapolations with a time sequence reveal that fields above pre-eruption F1 and F2 constituted a quadrupolar magnetic system with a possible null point. Moreover, the null point kept moving toward F2 and descending within the following hours. We infer that the rising F1 pushed its overlying fields toward the fields above stable F2 and caused successive external reconnection between the overlying fields. From outside to inside (lower and lower in height), the fields above pre-eruption F2 were gradually involved in the reconnection, manifesting as the inward-spreading brightening and extending dimming on the south side of F2. Furthermore, the external reconnection could reconfigure the overlying fields of F2 by transporting magnetic flux from its west part to the east part, which is further verified by the subsequent partial eruption of F2.Conclusions. We propose an integrated evidence chain to demonstrate the critical roles of external magnetic reconnection and the resultant reconfiguration of overlying fields on the sympathetic eruptions of two filaments.
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影响因子：
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作者：
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