Flare frequency associated with the abnormal helicity active regions

Details Flare frequency associated with the abnormal helicity active regions Flare frequency associated with the abnormal helicity active regions

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pbeio..37....5b&link_type=abstract

Astrophysics Reports. Publications of the Beijing Astronomical Observatory, No. 37, p. 5 - 8 (2001). In: Proceedings of the Eigh

Astronomy and Astrophysics

Astrophysics

Solar Active Regions, Solar Flares

Scientific paper

Based on the Huairou Solar Observing Station data set, we computed the current helicity for several hundreds of active regions and found that: (1) Active regions that do not follow the hemispheric helicity sign rule show more flare activity than normal active regions. (2) The relative number of active regions with reversed helicity sign is higher near sunspot maximum. (3) It appears that during solar cycle 22 the southern hemisphere has more the reversed-sign active regions and stronger flare activity than the northern hemisphere.

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