导致太阳耀斑爆发的暗条扭绞

TWISTING OF A FILAMENT RESULTED IN A SOLAR FLARE

本文主要根据Ｈａ线心和不同偏带的观测资料，结合紫外ＣＩＶ１５４８谱线的测量结果，分析研究了１９８０年６月２５日ＡＲ２５２２活动区中一段暗条在耀斑爆发前１５分钟所经历的三次逐渐增强的间歇式扭绞，最终导致暗条破裂和耀斑爆发的物理过程，并且用无力场磁绳近似模拟暗条的扭绞运动，估算了暗条扭绞引起的无力因子ａ的变化，轴向电流增大和守能，讨论了暗条的稳定性，试图对暗条的瓦解和耀斑爆发予以理论解释．

Basing on the filtergrams of Ha line center and various offbands, combining with the measurements of CIV 1548 line, the physical process of a filement was studied. The filament has three spasmodic and gradually enhanced twisting, resulted in a solar flare on 25 June 1980, about 15 minutes prior to that flare and located in AR2522. We simulated approximately the twisting of the filament by a force-free magnetic rope, estimated the variation of the force-free factor, a, as well as the increases of the axial electric current and the energy storage, discussed the instability of the filament, and tried out to explain theoretically the disruption of the filament and the occurrence of the flare.