Magnetic helicity effects in astrophysical and laboratory dynamos

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http://hdl.handle.net/10138/166268

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Brandenburg , A & Käpylä , P 2007 , ' Magnetic helicity effects in astrophysical and laboratory dynamos ' , New Journal of Physics , vol. 9 , pp. 305 . https://doi.org/10.1088/1367-2630/9/8/305

Title: Magnetic helicity effects in astrophysical and laboratory dynamos
Author: Brandenburg, A; Käpylä, Petri
Contributor: University of Helsinki, Department of Astronomy (-2009)
Date: 2007
Language: eng
Number of pages: 24
Belongs to series: New Journal of Physics
ISSN: 1367-2630
URI: http://hdl.handle.net/10138/166268
Abstract: Magnetic helicity effects are discussed in laboratory and astrophysical settings. Firstly, dynamo action in Taylor-Green flows is discussed for different boundary conditions. However, because of the lack of scale separation with respect to the container, no large-scale field is being produced and there is no resistively slow saturation phase as otherwise expected. Secondly, the build-up of a large-scale field is demonstrated in a simulation where a localized magnetic eddy produces field on a larger scale if the eddy possesses a swirl. Such a set-up might be realizable experimentally through coils. Finally, new emerging issues regarding the connection between magnetic helicity and the solar dynamo are discussed. It is demonstrated that dynamos with a nonlocal ( Babcock-Leighton type) a effect can also be catastrophically quenched, unless there are magnetic helicity fluxes.
Subject: 115 Astronomy, Space science
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