Rotating eruption of an untwisting filament triggered by the 3B flare of 25 April, 1984

摘要: A great 3B flare, whose X-ray class was X13, occurred over a delta-sunspot at 00: 01 UT on April 25, 1984. Before the strong magnetic shear found to be formed along neutral line in with motions of umbrae. The umbrae were caused by successive emergence flux rope. several groups sheared Hα threads and filaments merge into an elongated filament through delta-sunspot. In merging process helical twists reconnection as Pneuman's (1983) model. At post-maximum phase helically twisted spouted out untwisting rotation. Examining morphological dynamical features eruption, we concluded that it has some typical flare spray seems accelerated sweeping-magnetictwist mechanism proposed Shibata Uchida (1986).