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The critical role of magnetic helicity in astrophysical large-scale dynamos
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0002-7304-021X
2009 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 51, nr 12, s. 4043-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The role of magnetic helicity in astrophysical large-scale dynamos is reviewed and compared with cases where there is no energy supply and an initial magnetic field can only decay. In both cases magnetic energy tends to get redistributed to larger scales. Depending on the efficiency of magnetic helicity fluxes the decay of a helical field can speed up. Likewise, the saturation of a helical dynamo can speed up through magnetic helicity fluxes. The astrophysical importance of these processes is reviewed in the context of the solar dynamo and an estimated upper limit for the magnetic helicity flux of 1046 Mx2/cycle is given.

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2009. Vol. 51, nr 12, s. 4043-
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URN: urn:nbn:se:su:diva-32539DOI: 10.1088/0741-3335/51/12/124043ISI: 000271940800054ISBN: 0741-3335 (tryckt)OAI: oai:DiVA.org:su-32539DiVA, id: diva2:280881
Tilgjengelig fra: 2009-12-12 Laget: 2009-12-12 Sist oppdatert: 2022-03-09bibliografisk kontrollert

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Brandenburg, Axel

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