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Connections beween photospheric current helicity, flares and solar subsurface kinetic helicity

Published online by Cambridge University Press:  18 July 2013

Yu Gao ,
Junwei Zhao  and
Hongqi Zhang
Yu Gao
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, P. R. China email: gy@bao.ac.cn
Junwei Zhao
Affiliation:
W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA94305-4085, U.S.A.
Hongqi Zhang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, P. R. China email: gy@bao.ac.cn
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The α-effect is central to magnetic field generation in αΩ dynamo theory (Parker, 1955), however, it lacked observational and experimental supports over a long term (Sokoloff, 2007). Mirror asymmetries of magnetic field (magnetic helicity) were not observed until the recent 20 years (Seehafer, 1990; Pevtsov et al., 1995, Bao & Zhang, 1998). Later, the advancement in local helioseismology has made possible the measurements of solar subsurface velocity field and the vorticity (or kinetic helicity) as well (Zhao & Kosovichev, 2003). Apparently, frozen flow with the magnetic field in the fluid of high magnetic Reynold number is a necessary condition for the α-effect in the framework of Parker's dynamo model.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 531 - 532
Copyright
Copyright © International Astronomical Union 2013 

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