A NUMERICAL STUDY OF LONG-RANGE MAGNETIC IMPACTS DURING CORONAL MASS EJECTIONS
A NUMERICAL STUDY OF LONG-RANGE MAGNETIC IMPACTS DURING CORONAL MASS EJECTIONS
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DOI：
10.3847/0004-637x/820/1/16
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
M. Jin;C. Schrijver;M. Cheung;M. DeRosa;N. Nitta;A. Title
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作者：
M. Jin;C. Schrijver;M. Cheung;M. DeRosa;N. Nitta;A. Title
太阳动力学天文台/大气成像组件和日地关系天文台的全球视野和高节奏观测，许多空间分离的太阳爆发事件似乎是耦合的。然而，“交感神经”事件的机制在很大程度上仍然是未知的。在这项研究中，我们调查的爆发通量绳周围的太阳结构，通过大规模的磁耦合的影响。我们建立了一个现实的环境中的太阳日冕2011年2月15日使用全球磁流体动力学模型和启动日冕物质抛射（CME）的活动区11158通过插入Gibson-Low分析通量绳。我们发现，CME对周围结构的影响不仅取决于这些结构的磁场强度和它们到源区的距离，而且还取决于CME和大尺度磁场之间的相互作用。在日冕物质抛射膨胀域中，磁绳场直接与太阳结构相互作用，膨胀引起的重联往往会改变上覆场，从而增加衰变指数。这种效应可能提供了交感神经爆发的主要耦合机制。的影响的大小被发现取决于喷发的磁通绳的方向，最大的影响发生时，磁通绳是有利的方向与周围地区重新连接。在CME膨胀区外，CME的影响主要是通过磁力线压缩或喷发后弛豫来实现的。基于我们的数值实验，我们讨论了一种方法来量化喷发的影响，这可能是有用的预测目的。
With the global view and high-cadence observations from Solar Dynamics Observatory/Atmospheric Imaging Assembly and Solar TErrestrial RElations Observatory, many spatially separated solar eruptive events appear to be coupled. However, the mechanisms for “sympathetic” events are still largely unknown. In this study, we investigate the impact of an erupting flux rope on surrounding solar structures through large-scale magnetic coupling. We build a realistic environment of the solar corona on 2011 February 15 using a global magnetohydrodynamics model and initiate coronal mass ejections (CMEs) in active region 11158 by inserting Gibson–Low analytical flux ropes. We show that a CME’s impact on the surrounding structures depends not only on the magnetic strength of these structures and their distance to the source region, but also on the interaction between the CME and the large-scale magnetic field. Within the CME expansion domain where the flux rope field directly interacts with the solar structures, expansion-induced reconnection often modifies the overlying field, thereby increasing the decay index. This effect may provide a primary coupling mechanism underlying the sympathetic eruptions. The magnitude of the impact is found to depend on the orientation of the erupting flux rope, with the largest impacts occurring when the flux rope is favorably oriented for reconnecting with the surrounding regions. Outside the CME expansion domain, the influence of the CME is mainly through field line compression or post-eruption relaxation. Based on our numerical experiments, we discuss a way to quantify the eruption impact, which could be useful for forecasting purposes.