Study of Energy Build-up Mechanism for Solar Flare

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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.