Homologous Circular-ribbon Flares Driven by Twisted Flux Emergence
Homologous Circular-ribbon Flares Driven by Twisted Flux Emergence
复制标题
由扭曲通量驱动的同源圆带耀斑
DOI：
10.3847/1538-4357/aa9995
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发表时间：
2017-12
期刊：
影响因子：
--
通讯作者：
Kashapova L.
中科院分区：
文献类型：
--
作者：
Xu Z.;Yang K.;Guo Y.;Zhao J.;Zhao Z. J.;Kashapova L.
在本文中，我们报道了两个与两次暗条爆发有关的同源圆带状耀斑。2014年3月5日，新真空太阳望远镜和太阳动力学天文台对它们进行了很好的观测。在耀斑之前，两个小规模的灯丝被一个圆形的耀斑前增亮包围着，沿着围绕寄生极性的圆形极性反转线，从它第一次出现以来就显示出连续的旋转。两个灯丝最终爆发的顺序与两个同源的圆带状耀斑和显示一个明显的扭动签名。补充的非线性无力场外推和磁场挤压因子的调查，揭示了以下内容。(1)这一事件涉及到磁通量绳出现到一个预先存在的极性区域，这产生了一个三维零点拓扑结构的日冕的形成。(2)自由能以通量绳的形式从光球层下方连续输入，可能会在耀斑前增亮的支持下，驱动日冕高层发生爆发型重联。(3)这种初始重联可以释放对磁绳的约束，并触发MHD不稳定性，首先使细丝F1失去平衡。在暗条上升过程中，磁重联与上覆磁通的作用更加强烈。反过来，通过上述磁张力的减小进一步促进了细丝F2的喷发。这两个过程相互形成正反馈，导致高能物质爆发和耀斑。
In this paper, we report two homologous circular-ribbon flares associated with two filament eruptions. They were well observed by the New Vacuum Solar Telescope and the Solar Dynamics Observatory on 2014 March 5. Prior to the flare, two small-scale filaments enclosed by a circular pre-flare brightening lie along the circular polarity inversion line around the parasitic polarity, which has shown a continuous rotation since its first appearance. Two filaments eventually erupt in sequence associated with two homologous circular-ribbon flares and display an apparent writhing signature. Supplemented by the nonlinear force-free field extrapolation and the magnetic field squashing factor investigation, the following are revealed. (1) This event involves the emergence of magnetic flux ropes into a pre-existing polarity area, which yields the formation of a 3D null-point topology in the corona. (2) Continuous input of the free energy in the form of a flux rope from beneath the photosphere may drive a breakout-type reconnection occurring high in the corona, supported by the pre-flare brightening. (3) This initiation reconnection could release the constraint on the flux rope and trigger the MHD instability to first make filament F1 lose equilibrium. The subsequent more violent magnetic reconnection with the overlying flux is driven during the filament rising. In return, the eruption of filament F2 is further facilitated by the reduction of the magnetic tension force above. These two processes form a positive feedback to each other to cause the energetic mass eruption and flare.
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影响因子：
2.8
作者：
W. Pesnell;B. Thompson;P. Chamberlin
通讯作者：
W. Pesnell;B. Thompson;P. Chamberlin
DOI：
10.1086/462412
发表时间：
2005-07
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
T. Török;B. Kliem
通讯作者：
T. Török;B. Kliem
DOI：
10.3847/2041-8205/820/2/l37
发表时间：
2016-03
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Yao Chen;G. Du;Di Zhao;Zhao Wu;Wei Liu;B. Wang;G. Ruan;S. Feng;Hongqiang Song
通讯作者：
Yao Chen;G. Du;Di Zhao;Zhao Wu;Wei Liu;B. Wang;G. Ruan;S. Feng;Hongqiang Song
DOI：
10.1098/rsta.1996.0136
发表时间：
1996-12
期刊：
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
影响因子：
--
作者：
E. Priest;Viacheslav Titov
通讯作者：
E. Priest;Viacheslav Titov
影响因子：
2.8
作者：
S. Masson;G. Aulanier;E. Pariat;K. Klein
通讯作者：
S. Masson;G. Aulanier;E. Pariat;K. Klein