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arXiv 1406.3153astro-ph.SR
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由CME膨胀驱动的日冕磁重联--2011年6月7日事件

Coronal magnetic reconnection driven by CME expansion -- the 2011 June 7 event

L. van Driel-Gesztelyi, D. Baker, T. Torok, E. Pariat, L. M. Green, D. R. Williams, J. Carlyle, G. Valori, P. Demoulin, B. Kliem, D. M. Long, S. A. Matthews, J. -M. Malherbe

摘要:

日冕物质抛射(CME)在具有磁性结构的日冕中爆发和膨胀。各种间接观测证据表明,日冕物质抛射的磁场与周围的磁场重新连接,形成,例如,远离日冕物质抛射源区的暗区。分析太阳动力学天文台(SDO)对2011年6月7日AR 11226爆发的观测,我们提出了CME期间两个相邻AR场之间日冕磁重联的第一个直接证据。的观测结果与数据约束的数值模拟,展示了形成/加强电流片沿双曲线通量管(HFT)在CME和相邻的AR 11227之间的接口。重连导致AR 11226喷发的磁性结构和邻近的活动区AR 11227之间形成新的磁性连接,距离喷发地点约200 Mm。在SDO/AIA图像中,当最初包含在喷发通量绳中的丝状等离子体被重新导向AR 11227的偏远地区时,重连的开始首先变得明显,追踪大规模磁连通性的变化。日冕重联区的位置变得明亮,在SDO/AIA波长下可以直接观察到,这是因为在其附近存在向下流动的冷的、致密的(10^{10} cm^{-3})丝状等离子体。重联区域周围的高密度等离子体被加热到日冕温度,可能是由慢模式冲击和库仑碰撞造成的。这些结果提供了第一个直接的观测证据,证明日冕物质抛射与周围的磁结构重新连接,导致日冕磁场的大规模重新配置。

英文摘要:

Coronal mass ejections (CMEs) erupt and expand in a magnetically structured solar corona. Various indirect observational pieces of evidence have shown that the magnetic field of CMEs reconnects with surrounding magnetic fields, forming, e.g., dimming regions distant from the CME source regions. Analyzing Solar Dynamics Observatory (SDO) observations of the eruption from AR 11226 on 2011 June 7, we present the first direct evidence of coronal magnetic reconnection between the fields of two adjacent ARs during a CME. The observations are presented jointly with a data-constrained numerical simulation, demonstrating the formation/intensification of current sheets along a hyperbolic flux tube (HFT) at the interface between the CME and the neighbouring AR 11227. Reconnection resulted in the formation of new magnetic connections between the erupting magnetic structure from AR 11226 and the neighboring active region AR 11227 about 200 Mm from the eruption site. The onset of reconnection first becomes apparent in the SDO/AIA images when filament plasma, originally contained within the erupting flux rope, is re-directed towards remote areas in AR 11227, tracing the change of large-scale magnetic connectivity. The location of the coronal reconnection region becomes bright and directly observable at SDO/AIA wavelengths, owing to the presence of down-flowing cool, dense (10^{10} cm^{-3}) filament plasma in its vicinity. The high-density plasma around the reconnection region is heated to coronal temperatures, presumably by slow-mode shocks and Coulomb collisions. These results provide the first direct observational evidence that CMEs reconnect with surrounding magnetic structures, leading to a large-scale re-configuration of the coronal magnetic field.

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