Journal Article

A growing dynamo from a saturated Roberts flow dynamo

Andreas Tilgner and Axel Brandenburg

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 3, pages 1477-1481
Published in print December 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI:
A growing dynamo from a saturated Roberts flow dynamo

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Using direct simulations, weakly non-linear theory and non-linear mean-field theory, it is shown that the quenched velocity field of a saturated non-linear dynamo can itself act as a kinematic dynamo. The flow is driven by a forcing function that would produce a Roberts flow in the absence of a magnetic field. This result confirms an analogous finding by Cattaneo & Tobias for the more complicated case of turbulent convection, suggesting that this may be a common property of non-linear dynamos; see also the talk given online at the Kavli Institute for Theoretical Physics ( It is argued that this property can be used to test non-linear mean-field dynamo theories.

Keywords: hydrodynamics; magnetic fields; MHD

Journal Article.  3725 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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