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Dynamo quenching due to shear flow

Leprovost, N. and Kim, E. (2008) Dynamo quenching due to shear flow. Physical Review Letters, 100. Art no. 144502. ISSN 0031-9007

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Abstract

We provide a theory of dynamo (α effect) and momentum transport in three-dimensional magnetohydrodynamics. For the first time, we show that the α effect is reduced by the shear even in the absence of magnetic field. The α effect is further suppressed by magnetic fields well below equipartition (with the large-scale flow) with different scalings depending on the relative strength of shear and magnetic field. The turbulent viscosity is also found to be significantly reduced by shear and magnetic fields, with positive value. These results suggest a crucial effect of shear and magnetic field on dynamo quenching and momentum transport reduction, with important implications for laboratory and astrophysical plasmas, in particular, for the dynamics of the Sun.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 American Physical Society. This is an author produced version of a paper subsequently published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy.
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 29 Mar 2010 11:53
Last Modified: 08 Feb 2013 17:00
Published Version: http://dx.doi.org/10.1103/PhysRevLett.100.144502
Status: Published
Publisher: American Physical Society
Identification Number: 10.1103/PhysRevLett.100.144502
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10508

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