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Ma kaiquan, Hong Qinfang, Li Qiongying. A 3B Flare of 1989 April 9[J]. Publications of the Yunnan Observatory, 1990, (1): 14-16.
Citation: Ma kaiquan, Hong Qinfang, Li Qiongying. A 3B Flare of 1989 April 9[J]. Publications of the Yunnan Observatory, 1990, (1): 14-16.

A 3B Flare of 1989 April 9

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  • Received Date: July 02, 1989
  • Published Date: January 14, 1990
  • A 3B flare which occurred in a spotless region on April 9, 1989, is morphologically analysed. The main results arc thcwn as follows. 1. The flare has the two-ribbon structure, and the active filaments arc surrounded by the two ribbons. 2. There are obvious changes in the S-shaped active filaments relevant with the flare before and after the flare eruption, and all of the filaments disappear at last. 3. The X-ray events of the flare cause a class-one SID and a class-two SID, respectively. 4. The off-band obecrvations show that there exists the descending motion of material during the eruption of the flare. 5. There is the spiral structure in the sunspot penumbra.
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