Abstract

The development of the 3N/M6.4 flare on July 19, 2000, in the active region NOAA 9087 was studied based on the analysis of its images in the Н_α line. Н_α filtergrams obtained at the Meudon Observatory were used. The flare-active region NOAA 9087 had a complex multipolar magnetic field structure. The flare of 3N/M6.4 class began with the appearance of two bright kernels near a large spot. A few minutes later, flare kernels appeared in the central part of the active region, where a coronal source of hard X-ray radiation was identified. The flare lasted 2.5 h. Its energy was released sequentially in different places of the active region. The flare kernels were located along the polarity inversion line at the boundaries of the chromospheric cells. The flare ribbons had a circular shape. An assumption is made about the magnetic topology of the fan-spine type containing a null point. In this case, flare ribbons are the intersections of the fan quasi-separatrix layer with the lower atmosphere. The successive appearance of flare kernels may indicate a slipping magnetic reconnection in the flare. The Н_α images in the main phase of the flare show reconnecting loops in the eastern part of the active region that are clearly visible in the ultraviolet wavelength range.

中文翻译：

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根据Нα线的观测结果发展M6.4圆形太阳耀斑

摘要

在3N / 6.4级的发展光斑于2000年7月19日，基于其在Н图像的分析在有源区NOAA 9087进行了研究_α线。Н _α使用在Meudon天文台获得的过滤图。耀斑活跃区NOAA 9087具有复杂的多极磁场结构。3N / M6.4级火炬始于在一个大斑点附近出现两个明亮的核仁。几分钟后，火炬粒出现在活动区域​​的中心部分，在那里确定了硬X射线辐射的冠状源。耀斑持续了2.5小时。它的能量在有源区的不同位置依次释放。火炬粒沿着极性反转线位于色球层细胞的边界处。火炬带呈圆形。对包含零点的扇脊型磁拓扑进行假设。在这种情况下，火炬带是风扇准分离层与较低大气层的交点。火炬核的连续出现可能表明火炬中发生了滑移的磁重连。Н耀斑主相中的_α图像在活性区域的东部显示了重新连接的环路，这些环路在紫外波长范围内清晰可见。