Mean field electrodynamics: triumphs and tribulations

Abstract

The theory of mean field electrodynamics, now celebrating its fiftieth birthday, has had a profound influence on our modelling of cosmical dynamos, greatly enhancing our understanding of how such dynamos may operate. Here I discuss some of its undoubted triumphs, but also some of the problems that can arise in a mean field approach to dynamos in fluids (or plasmas) that are both highly turbulent and also extremely good electrical conductors, as found in all astrophysical settings.

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Authors/Creators:	Hughes, DW https://orcid.org/0000-0002-8004-8631
Copyright, Publisher and Additional Information:	© 2018, Cambridge University Press. This article has been published in a revised form in Journal of Plasma Physics [https:// doi.org/10.1017/S0022377818000855]. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	astrophysical plasmas
Dates:	Accepted: 28 June 2018 Published (online): 13 August 2018 Published: August 2018
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:	19 Jul 2018 10:25
Last Modified:	13 Feb 2019 01:39
Status:	Published
Publisher:	Cambridge University Press
Identification Number:	https://doi.org/10.1017/S0022377818000855

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Mean field electrodynamics: triumphs and tribulations

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