EVIDENCE FOR A PRE-ERUPTIVE TWISTED FLUX ROPE USING THE THEMIS VECTOR MAGNETOGRAPH

EVIDENCE FOR A PRE-ERUPTIVE TWISTED FLUX ROPE USING THE THEMIS VECTOR MAGNETOGRAPH
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使用 Themis 矢量磁力图证明喷发前扭曲磁力绳的证据

DOI:
10.1088/0004-637x/693/1/l27
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发表时间:
2009-03
影响因子:
7.9
通讯作者:
Bommier, V.
Bommier, V.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Amari, T.;Aulanier, G.;Schmieder, B.;Canou, A.;Li, H.;Bommier, V.

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尽管有证据表明大规模喷发事件期间会形成扭曲结构,但目前尚不清楚这些结构是否在喷发前阶段作为平衡的扭曲通量绳(TFR)存在。这个问题已经成为一个主要的问题,因为几个理论机制可以导致TFR的形成。这些模型考虑了由光球变化驱动的日冕结构的演变或对流区TFR的出现。我们认为,作为一个目标,为解决这个问题的活动区NOAA AR 10808已知的起源几个大规模的喷发现象,并与δ点的出现。利用THEMIS矢量磁象作为低日冕非线性无力重建模型的光球边界条件,在没有任何其他假设的情况下,我们证明了所得到的爆发前位形在新出现的δ-斑的中性线以上具有一个TFR。此外,这种配置的自由磁能甚至可以大到足以解释这种大规模的喷发事件。
Although there is evidence that twisted structures form during large-scale eruptive events, it is not yet clear whether these exist in the pre-eruptive phase as twisted flux ropes (TFRs) in equilibrium. This question has become a major issue since several theoretical mechanisms can lead to the formation of TFRs. These models consider either the evolution of a coronal configuration driven by photospheric changes or the emergence of TFR from the convection zone. We consider as a target for addressing this issue the active region NOAA AR 10808 known at the origin of several large-scale eruptive phenomena, and associated with the emergence of a δ-spot. Using the THEMIS vector magnetogram as photospheric boundary conditions for our nonlinear force-free reconstruction model of the low corona and without any other assumption, we show that the resulting pre-eruptive configuration exhibits a TFR above the neutral line of the emerging δ-spot. In addition, the free magnetic energy of this configuration could even be large enough to explain such resulting large-scale eruptive events.
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