FLUX ROPE FORMATION PRECEDING CORONAL MASS EJECTION ONSET

FLUX ROPE FORMATION PRECEDING CORONAL MASS EJECTION ONSET
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DOI:
10.1088/0004-637x/700/2/l83
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发表时间:
2009-08-01
影响因子:
7.9
通讯作者:
Kliem, B.
Kliem, B.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Green, L. M.;Kliem, B.

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我们分析了一个S形(S形)的活动区域向喷发的演变,其中包括日冕物质抛射(CME),但留下的灯丝的一部分。发现X射线S形追踪出三个不同的磁拓扑结构的连续:一个高度剪切拱廊的日冕循环在其长寿命的阶段,秃补丁分界面(BPSS)在CME前几个小时,和第一耀斑循环在其主要的瞬态强度增强。日冕演化是由光球层的变化驱动的,包括S形和暗条下通量元素的会聚和抵消。这些数据产生明确的证据存在的BPSS,因此,在日冕的磁通绳开始之前的日冕物质抛射。
We analyze the evolution of a sigmoidal (S-shaped) active region toward eruption, which includes a coronal mass ejection (CME) but leaves part of the filament in place. The X-ray sigmoid is found to trace out three different magnetic topologies in succession: a highly sheared arcade of coronal loops in its long-lived phase, a bald-patch separatrix surface (BPSS) in the hours before the CME, and the first flare loops in its major transient intensity enhancement. The coronal evolution is driven by photospheric changes which involve the convergence and cancellation of flux elements under the sigmoid and filament. The data yield unambiguous evidence for the existence of a BPSS, and hence a flux rope, in the corona prior to the onset of the CME.