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LOOP STRUCTURES IN THE JULY 19, 1999 SOLAR FLARE

机译:1999年7月19日的太阳耀斑的环形结构

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摘要

Comparing the SOHO/EIT 195A and Hα images (Hvar and Modra Observatories) with the magnetic field extrapolations of SOHO/MDI magnetograms the loop structures of the July 19, 1999 flare were analyzed. The presence of the current-carrying flux rope was identified by its deviation from the current-free magnetic field extrapolation and "umbrella hand" shape of the Hα ribbons. After the flare start in the neighboring "cone" arcade this current-carrying flux rope interacts (reconnects) with this arcade, forming thus flare loops spanning over both these magnetic structures. During these processes several cross-loop structures appeared. One of them indicates the flare loop interaction. At this space the extended helical structure, possibly a remnant of some current-carrying flux rope, was found. The pitch angle of this helical thread v = 61°was determined. Assuming then the magnetic field as 10~(-4)-10~(-3) T, the total electric current in the helical structure was estimated as J = 4.8 x (10~9 - 10~(10))A.
机译:将SOHO / EIT 195A和Hα图像(Hvar和Modra天文台)与SOHO / MDI磁图的磁场外推进行比较,分析了1999年7月19日耀斑的环形结构。通过其与无电流磁场外推和Hα带的“伞形”形状的偏离来识别载流通量绳的存在。在邻近的“锥形”拱廊中开始爆发后,载流通量绳与该拱廊相互作用(重新连接),从而形成跨越这两个磁性结构的爆发环。在这些过程中,出现了几个交叉环结构。其中之一表示耀斑环相互作用。在这个空间中,发现了扩展的螺旋结构,可能是一些载流通量绳的残余。确定该螺旋螺纹的螺距角v = 61°。假设磁场为10〜(-4)-10〜(-3)T,则螺旋结构中的总电流估计为J = 4.8 x(10〜9-10〜(10))A。

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