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Magnetic helicity fluxes in αΩ dynamos

Published online by Cambridge University Press:  08 June 2011

Simon Candelaresi  and
Axel Brandenburg
Simon Candelaresi
Affiliation:
NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm, SwedenDepartment of Astronomy, Stockholm University, SE 10691 Stockholm, Sweden
Axel Brandenburg
Affiliation:
NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm, SwedenDepartment of Astronomy, Stockholm University, SE 10691 Stockholm, Sweden
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Abstract

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In turbulent dynamos the production of large-scale magnetic fields is accompanied by a separation of magnetic helicity in scale. The large- and small-scale parts increase in magnitude. The small-scale part can eventually work against the dynamo and quench it, especially at high magnetic Reynolds numbers. A one-dimensional mean-field model of a dynamo is presented where diffusive magnetic helicity fluxes within the domain are important. It turns out that this effect helps to alleviate the quenching. Here we show that internal magnetic helicity fluxes, even within one hemisphere, can be important for alleviating catastrophic quenching.

Keywords

Sun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 464 - 466
Copyright
Copyright © International Astronomical Union 2011

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