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Flare Occurrence in the Solar Active Regions with Reversed Helicity Sign

Published online by Cambridge University Press:  13 May 2016

S. D. Bao ,
G. X. Ai  and
H. Q. Zhang
S. D. Bao
Affiliation:
Beijing Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
G. X. Ai
Affiliation:
Beijing Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
H. Q. Zhang
Affiliation:
Beijing Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China

Abstract

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Based on the Huairou Solar Observing Station dataset, 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.

Type
Session III: Active Region Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 247 - 250
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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