A current sheet traced from the Sun to interplanetary space
A current sheet traced from the Sun to interplanetary space
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DOI：
10.1051/0004-6361/201015726
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发表时间：
2012-07
影响因子：
6.5
通讯作者：
Guiping Zhou;C. Xiao;Jun Wang;M. Wheatland;Hui Zhao
中科院分区：
文献类型：
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作者：
Guiping Zhou;C. Xiao;Jun Wang;M. Wheatland;Hui Zhao
上下文磁重联是理解太阳活动的核心概念，包括暗条爆发、耀斑和日冕物质抛射（CME）。横向和垂直电流片的存在，在太阳大气中发生重联的地方，经常被提出作为耀斑/CME模型的先决条件，但很少在观测中确定。目标。我们的目标是确定一个横向电流片，存在于前CME结构，并持续从CME太阳源行星际空间。方法. STEREO A/B为我们提供了一个计算磁云行星际电流片的独特机会。我们利用组合观测分析了与2006年12月13日快晕CME相关的这种结构。磁云前部的电流片被分析到其起源于CME太阳源中的横向电流片，这可以在磁场外推、XRT和LASCO观测中得到揭示。结果行星际电流片被确定为来自CME太阳源通过仔细映射和检查从太阳到行星际空间的多个观测，沿着与非线性无力磁场外推的活动区NOAA 10930。结论.耀斑前的结构是一个全球性的横向电流片，它在CME的启动中起作用，并从日冕传播到行星际空间。
Context. Magnetic reconnection is a central concept for understanding solar activity, including filament eruptions, flares, and coronal mass ejections (CMEs). The existence of transverse and vertical current sheets, sites where reconnection takes place in the solar atmosphere, is frequently proposed as a precondition for flare/CME models, but is rarely identified in observations. Aims. We aim at identifying a transverse current sheet that existed in the pre-CME structure and persisted from the CME solar source to interplanetary space. Methods. STEREO A/B provide us a unique opportunity to calculate the interplanetary current sheets for the magnetic cloud. We analyze such a structure related to the fast halo CME of 2006 December 13 with assembled observations. A current sheet at the front of the magnetic cloud is analyzed to its origin in a transverse current sheet in the CME solar source, which can be revealed in the magnetic field extrapolations, XRT, and LASCO observations. Results. An interplanetary current sheet is identified as coming from the CME solar source by carefully mapping and examining multiple observations from the Sun to interplanetary space, along with nonlinear force-free magnetic field extrapolations of the active region NOAA 10930. Conclusions. The structure identified in the pre-flare state is a global transverse current sheet, which plays a role in the CME initiation, and propagates from the corona to interplanetary space.