Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope
Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope
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DOI：
10.1051/0004-6361/201527966
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发表时间：
2016-05
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通讯作者：
M. Sobotka;J. Dud'ik;C. Denker;H. Balthasar;J. Jurvc'ak;W. Liu;T. Berkefeld;M. C. Vera;A. Feller;A. Hofmann;F. Kneer;C. Kuckein;A. Lagg;R. Louis;O. V. D. Luhe;H. Nicklas;R. Schlichenmaier;D. Schmidt;W. Schmidt;M. Sigwarth;S. Solanki;D. Soltau;J. Staude;K. Strassmeier;R. Volkmer;T. Waldmann
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作者：
M. Sobotka;J. Dud'ik;C. Denker;H. Balthasar;J. Jurvc'ak;W. Liu;T. Berkefeld;M. C. Vera;A. Feller;A. Hofmann;F. Kneer;C. Kuckein;A. Lagg;R. Louis;O. V. D. Luhe;H. Nicklas;R. Schlichenmaier;D. Schmidt;W. Schmidt;M. Sigwarth;S. Solanki;D. Soltau;J. Staude;K. Strassmeier;R. Volkmer;T. Waldmann
2014年11月7日12：00 UT，在1.5 m GREGOR望远镜的蓝色成像通道中，使用1 A Ca II H干涉滤光片，在活动区12205的太阳黑子本影上方观察到一个小耀斑带。来自太阳动力学天文台（SDO）上的大气成像组件（AIA），太阳光学望远镜（SOT）和界面区域成像光谱仪（IRIS）的背景观测表明，这条带状物是一个更大的带状物的一部分，该带状物延伸通过相邻的正极，并且还参与了活动区域内的其他几次耀斑。我们重建了一个时间序列的140秒的Ca II H图像的多帧盲反卷积方法，这导致在0.1 arcsec和1秒的空间和时间分辨率的装置。测量了耀斑带中小尺度亮节的光变曲线和水平速度。有些节点是静止的，但有三个节点以7-11公里/秒的速度沿带状物沿着移动。其中两个在相反的方向上移动，并表现出高度相关的强度变化，这提供了在小空间尺度上滑动重联的证据。
A small flare ribbon above a sunspot umbra in active region 12205 was observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5 m GREGOR telescope, using a 1 A Ca II H interference filter. Context observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO), the Solar Optical Telescope (SOT) onboard Hinode, and the Interface Region Imaging Spectrograph (IRIS) show that this ribbon is part of a larger one that extends through the neighboring positive polarities and also participates in several other flares within the active region. We reconstructed a time series of 140 seconds of Ca II H images by means of the multiframe blind deconvolution method, which resulted in spatial and temporal resolutions of 0.1 arcsec and 1 s. Light curves and horizontal velocities of small-scale bright knots in the observed flare ribbon were measured. Some knots are stationary, but three move along the ribbon with speeds of 7-11 km/s. Two of them move in the opposite direction and exhibit highly correlated intensity changes, which provides evidence of a slipping reconnection at small spatial scales.