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Title:
A growing dynamo from a saturated Roberts flow dynamo
Authors:
Tilgner, Andreas; Brandenburg, Axel
Affiliation:
AA(Institute of Geophysics, University of Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany), AB(NORDITA, Roslagstullsbacken 23, SE - 106 91 Stockholm, Sweden)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 391, Issue 3, pp. 1477-1481. (MNRAS Homepage)
Publication Date:
12/2008
Origin:
MNRAS
Astronomy Keywords:
hydrodynamics , magnetic fields , MHD
DOI:
10.1111/j.1365-2966.2008.14006.x
Bibliographic Code:
2008MNRAS.391.1477T

Abstract

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 (http://online.kitp.ucsb.edu/online/dynamo_c08/cattaneo). It is argued that this property can be used to test non-linear mean-field dynamo theories.
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