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Article overview
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Helical Magnetic Fields in Solar Active Regions: Theory vs. Observations | K. Petrovay
; P. Chaterjee
; A. Choudhuri
; | Date: |
2 Feb 2007 | Journal: | Publ. Astron. Dep. Eotvos Univ. 17, 5-14 (2006) | Abstract: | 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. | Source: | arXiv, astro-ph/0702073 | Services: | Forum | Review | PDF | Favorites |
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