与耀斑相关的磁场演化

THE EVOLUTION OF MAGNETIC FIELDASSOCIATED WITH SOLAR FLARES

本文利用紫金山天文台太阳光谱仪缝前附属Ｄａｙｓｔａｒ滤光器拍摄的，发生在ＮＯＡＡ５３９５活动区中的三个耀斑的Ｈα单色光资料，对比北京天文台怀柔观测站取得的光球磁场资料，研究耀斑产生位置与光球磁场演化的关系．结果表明：（１）在所研究的５０个耀斑亮核中，有３８个位于新浮磁流区附近，另有少数亮核出现在磁对消区；（２）耀斑亮核多集中在横场方向交叉，剪切角大的复杂磁区，耀斑后多数区域磁场结构简化；（３）耀斑开始后，有些活动区的磁流还会继续增强，磁剪切角还会增大，说明耀斑过程中一方面释放和转化能量，另一方面还可能继续储能．最后，本文还对各种活动区磁场演化特征进行简要地讨论．

Comparing the high resolution data of Ha monochromatic images about Boulder AR. 5395 obtained at Purple Mountain Observatory with Huairou magnetograms, the relations between the locations of the solar flares and the evolutions of the magnetic fields have been investigated. The results indicate: (l)among the 50 bright knots of three flares, 38 were located close to the regions of emerging magnetic flux, and some others were close to the regions of cancelling magnetic flux; (2) most of the bright knots located at the regions of great magnetic shear, and the magnetic shear were relaxed after the flare. It means that the electric current in active regions is an important role for flare trigger, (3) sometimes the magnetic flux can be strengthened during the course of solar flare.Finally in this paper, various features of magnetic evolution are briefly discussed.