Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pbeio..38....6l&link_type=abstract
Astrophysics Reports. Publications of the Beijing Astronomical Observatory, No. 38, p. 6 - 17 (2002). In: Proceedings of the Nin
Astronomy and Astrophysics
Astrophysics
Solar Flares, Solar Magnetic Field, Reversals
Scientific paper
On July 14, 2000, a powerful solar flare (X5.7/3B) associated with a violent halo CME launched in active region NOAA 9077 near the solar disk center. By using the time sequence of the solar photospheric vector magnetograms and Hβ chromospheric magnetograms, and Hβ filtergrams from Huairou Solar Observating Station (HSOS), we explored the causes of the flares eruption. We found that before the flares occurred, there are rare, complicated evolutions of the magnetic fields in the active region. We conclude that the occurrence of reversed polarity structures (RPSs) in vector magnetic fields were closely related to the eruption of X5.7/3B flare and surge, and they should be the key ingredient to the high flare-productivity of sunspot group, especially, number and extent of the occurrences of the RPS in an active region could determine the solar event level.
Bao Xingming
Deng Yuanyong
Li Wangrong
Yan Yihua
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