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Magnetic helicity as a probe of magnetic flux-tube dynamics in the solar interior

Published online by Cambridge University Press:  18 July 2013

Takashi Sakurai ,
Yu Gao  and
Kirill Kuzanyan
Takashi Sakurai
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan email: [email protected]
Yu Gao
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Kirill Kuzanyan
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan email: [email protected] National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China IZMIRAN, Russian Acacemy of Science, Moscow, Russia
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Abstract

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Magnetic helicity (volume integral of the product of the magnetic field vector B and the vector potential A), or its proxy, the current helicity at the surface (surface integral of B·J or BzJz), is an important quantity which characterizes the helical nature of solar magnetic fields. The current helicity on the Sun shows a tendency, though with large dispersion, that it is positive in the southern hemisphere and negative in the northern hemisphere (the helicity sign rule). However, there are indications that the helicity sign rule may be reversed at activity minimum periods. We will discuss the significance of this property by focusing on the statistical distributions of helicity whether its dispersion follows Gaussian distribution or not.

Keywords

Sun:magnetic fieldsSun:interiormagnetohydrodyamicsmethods:data analysis
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 301 - 306
Copyright
Copyright © International Astronomical Union 2013 

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