交感神经双纤维放电时外部重联和叠加磁场的重构
External reconnection and resultant reconfiguration of overlying magnetic fields during sympathetic eruptions of two filaments
摘要：
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，我们调查了2015年11月15日至16日的交感神经事件，涉及两个细丝的连续爆发，表现出丰富的交感神经特征。两个暗条（F1和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，我们推测上升的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来证明外部磁重联和由此产生的重新配置的叠加场的交感神经爆发的两个灯丝的关键作用。
英文摘要：
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. Here we investigate a sympathetic event involving successive eruptions of two filaments on 2015 November 15-16, which presented abundant sympathetic characteristics. The two filaments (F1 and F2) were separated by a narrow region of negative polarity, and F1 firstly 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 towards F2 and descending within the following hours.We infer that the rising F1 pushed its overlying fields towards 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. 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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