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A new constraint on mean-field galactic dynamo theory
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 468, no 3, 3657-3662 p.Article in journal (Refereed) Published
Abstract [en]

Appealing to an analytical result from mean-field theory, we show, using a generic galaxy model, that galactic dynamo action can be suppressed by small-scale magnetic fluctuations. This is caused by the magnetic analogue of the Radler or Omega x J effect, where rotation-induced corrections to the mean-field turbulent transport result in what we interpret to be an effective reduction of the standard a effect in the presence of small-scale magnetic fields.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 468, no 3, 3657-3662 p.
Keyword [en]
dynamo, magnetic fields, MHD, galaxies: magnetic fields
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-210467DOI: 10.1093/mnras/stx706ISI: 000402808700089OAI: oai:DiVA.org:kth-210467DiVA: diva2:1120454
Note

QC 20170706

Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2017-07-06Bibliographically approved

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Singh, Nishant K.
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