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Paradigm shifts in solar dynamo modeling

Published online by Cambridge University Press:  01 November 2008

Axel Brandenburg*
Affiliation:
Nordita, Roslagstullsbacken 23, 10691 Stockholm, Sweden
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Abstract

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Selected topics in solar dynamo theory are being highlighted. The possible relevance of the near-surface shear layer is discussed. The role of turbulent downward pumping is mentioned in connection with earlier concerns that a dynamo-generated magnetic field would be rapidly lost from the convection zone by magnetic buoyancy. It is argued that shear-mediated small-scale magnetic helicity fluxes are responsible for the success of some of the recent large-scale dynamo simulations. These fluxes help in disposing of excess small-scale magnetic helicity. This small-scale magnetic helicity, in turn, is generated in response to the production of an overall tilt in each Parker loop. Some preliminary calculations of this helicity flux are presented for a system with uniform shear. In the Sun the effects of magnetic helicity fluxes may be seen in coronal mass ejections shedding large amounts of magnetic helicity.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

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