Study of Energy Build-up Mechanism for Solar Flare

主要研究结果如下：(1)当一个新出现的通量区沿着一个较老的双极黑子对之间的中性线迅速发展出一个强磁切变时，就会产生一个强烈的耀斑活动。这一事实有力地表明，最初在对流区缠绕的扭曲磁绳的连续出现，发展了一种强烈的产生耀斑的磁切变.(2)通过日达DST和Yohkoh SXT的协调观测，成功地获得了许多重要的数据，使我们能够研究Halpha拱丝系统(AFS)与软X射线微耀斑之间的关系.特别值得注意的是，1994年6月11日0057UT微耀斑发生时，Halpha AFS环的出现与软X射线日冕环变亮之间首次发现了密切的偶然联系；日冕环在Halpha-0.6A中出现Halpha环后约5分钟达到最大强度，但增亮的X射线环在空间上并不完全与出现的Halpha AFS环重合。这两个环的方向彼此倾斜约20度。这一证据意味着，新出现的Halpha环并不是简单地演化成一个热冕环，而是Halpha环和先前存在的日冕磁场之间的某种重新连接产生了日冕亮化或微耀斑。

Main results obtained in this research are summarized in the followings :(1) A strong flare activity is produced, whenever a new emerging flux region rapidly develops a strong magmetic shear along the neutral line between an older bipolar sunspot pair. This fact strongly suggests that the successive emergence of a twisted flux rope, which is originally twisted in the convection zone, develops a strong and flare-productive magnetic shear.(2) Many important data which enable us to study the relation between Halpha arch filament system (AFS) and soft X-ray microflares were successfuly obtained by the coordinated observations between the Hida DST and theYohkoh SXT.Especially noticeable is the first finding of the close casual relationship between emergence of an Halpha AFS loop and brightening of a soft X-ray coronal loop at the time of the microflare of 0057 UT on 11 June, 1994 ; the coronal loop attained its intensity maximum about 5 minutes after the the appearance of the emerging Halpha loop in Halpha-0.6 A.However, the brightening X-ray loop dose not completely coincide in space with the emerging Halpha AFS loop. The directions of the two loops incline by about 20 dgrees from each other. This evidence means that the emerging Halpha loop did not simply evolve into a hot coronal loop, but that some reconnection between the Halpha loop and the pre-existing coronal magnetic field produced the coronal brightening or the microflare.