Helical Magnetic Fields in Solar Active Regions: Theory vs. Observations

Details Helical Magnetic Fields in Solar Active Regions: Theory vs. Observations Helical Magnetic Fields in Solar Active Regions: Theory vs. Observations

2007-02-02

arxiv.org/abs/astro-ph/0702073v1

Publ.Astron.Dep.EotvosUniv.17:5-14,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures

Scientific paper

The mean value of the normalized current helicity in solar active regions is on the order of 1e-8 1/m, negative in the northern hemisphere, positive in the southern hemisphere. Observations indicate that this helicity has a subsurface origin. Possible mechanisms leading to a twist of this amplitude in magnetic flux tubes include the solar dynamo, convective buffeting of rising flux tubes, and the accretion of weak external poloidal flux by a rising toroidal flux tube. After briefly reviewing the observational and theoretical constraints on the origin of helicity, we present a recently developed detailed model for poloidal flux accretion.

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