High-resolution observations of flare precursors in the low solar atmosphere
High-resolution observations of flare precursors in the low solar atmosphere
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低太阳大气中耀斑前兆的高分辨率观测
DOI：
10.1038/s41550-017-0085
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发表时间：
2017-03
期刊：
影响因子：
14.1
通讯作者：
Cao Wenda
中科院分区：
文献类型：
--
作者：
Wang Haimin;Liu Chang;Ahn Kwangsu;Xu Yan;Jing Ju;Deng Na;Huang Nengyi;Liu Rui;Kusano Kanya;Fleishman Gregory D.;Gary Dale E.;Cao Wenda
太阳耀斑通常被认为是由储存在日冕中的自由磁能提供动力，但日冕能量的积累本身可能不足以引发耀斑的发生。耀斑爆发机制是一个关键但知之甚少的问题，可以从称为前兆的小规模能量释放中获得见解。这些前体被观察到作为小的耀斑前增亮在各种波长，也从某些小规模的磁配置，如相反极性的通量，其中的小双极的磁取向是相反的环境的主要极性。然而，缺乏对耀斑前兆以及相关光球磁场动态的高分辨率观测。在这里，我们研究耀斑的前兆使用前所未有的时空分辨率的1.6米新太阳望远镜，辅以新的微波数据。两集的前体增亮开始在一个小规模的磁通道-（一种形式的相反极性的磁通量）与多个极性反转和增强的磁通量和电流，位于附近的脚点剪切磁回路。微波光谱证实，这些前体排放源自大气。这些结果提供了低大气层小规模能量释放的证据，可能与主耀斑的爆发有关。
Solar flares are generally believed to be powered by free magnetic energy stored in the corona, but the build up of coronal energy alone may be insufficient to trigger the flare to occur. The flare onset mechanism is a critical but poorly understood problem, insights into which could be gained from small-scale energy releases known as precursors. These precursors are observed as small pre-flare brightenings in various wavelengths–and also from certain small-scale magnetic configurations such as opposite-polarity fluxes–, where the magnetic orientation of small bipoles is opposite to that of the ambient main polarities. However, high-resolution observations of flare precursors together with the associated photospheric magnetic field dynamics are lacking. Here we study precursors of a flare using the unprecedented spatiotemporal resolution of the 1.6-m New Solar Telescope, complemented by new microwave data. Two episodes of precursor brightenings are initiated at a small-scale magnetic channel–(a form of opposite-polarity flux) with multiple polarity inversions and enhanced magnetic fluxes and currents, lying near the footpoints of sheared magnetic loops. Microwave spectra corroborate that these precursor emissions originate in the atmosphere. These results provide evidence of low-atmospheric small-scale energy release, possibly linked to the onset of the main flare.
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太阳耀斑早期上升阶段传导驱动蒸发的观测
影响因子：
6.5
作者：
Battaglia M
通讯作者：
Battaglia M
DOI：
10.1088/0004-637x/698/2/l183
发表时间：
2009-06
期刊：
The Astrophysical Journal
影响因子：
--
作者：
G. Fleishman;G. Nita;D. Gary
通讯作者：
G. Fleishman;G. Nita;D. Gary
DOI：
10.1088/1009-9271/6/4/11
发表时间：
2006-08
期刊：
Chinese Journal of Astronomy and Astrophysics
影响因子：
--
作者：
Haimin Wang;Hui Song;J. Jing;V. Yurchyshyn;Yuanyong Deng;Hongqi Zhang;D. Falconer;Jing Li
通讯作者：
Haimin Wang;Hui Song;J. Jing;V. Yurchyshyn;Yuanyong Deng;Hongqi Zhang;D. Falconer;Jing Li
影响因子：
64.8
作者：
H. Zirin;H. Wang
通讯作者：
H. Zirin;H. Wang
影响因子：
0.9
作者：
Goode, P. R.;Coulter, R.;Cao, W.
通讯作者：
Cao, W.