Nigro, G, Pongkitiwanichakul, P, Cattaneo, F et al. (1 more author) (2017) What is a large-scale dynamo? Monthly Notices of the Royal Astronomical Society, 464 (1). pp. 119-123. ISSN 0035-8711
Abstract
We consider kinematic dynamo action in a sheared helical flow at moderate to high values of the magnetic Reynolds number Rm. We find exponentially growing solutions which, for large enough shear, take the form of a coherent part embedded in incoherent fluctuations. We argue that at large Rm large-scale dynamo action should be identified by the presence of structures coherent in time, rather than those at large spatial scales. We further argue that although the growth-rate is determined by small-scale processes, the period of the coherent structures is set by mean-field considerations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2017, Oxford University Press . This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Nigro, G, Pongkitiwanichakul, P, Cattaneo, F et al. (1 more author) (2017) What is a large-scale dynamo? Monthly Notices of the Royal Astronomical Society, 464 (1). pp. 119-123 is available online at https://doi.org/10.1093/mnrasl/slw190 |
Keywords: | dynamo; magnetic fields |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 23 Sep 2016 09:20 |
Last Modified: | 02 Jul 2017 05:53 |
Published Version: | https://doi.org/10.1093/mnrasl/slw190 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnrasl/slw190 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104788 |