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Kinematic dynamos driven by thermal-wind flows

Lookup NU author(s): Dr Graeme Sarson

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Abstract

Most kinematic dynamos have been constructed without reference to the magneto-hydrodynamics applicable to the geodynamo; none of the simple cases in the literature are consistent with the magnetostrophic regime expected in the Earth's core. A simple flow that can be driven by the thermal-wind term present in this regime is constructed. This flow is shown to act as a dynamo, via direct three-dimensional calculations and via αω-calculations in the axisymmetric Braginsky limit. The temperature field and heat-source distribution necessary to drive this velocity are considered; although artificial, these forms could be of use in the construction of laboratory dynamos.


Publication metadata

Author(s): Sarson GR

Publication type: Article

Publication status: Published

Journal: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences

Year: 2003

Volume: 459

Issue: 2033

Pages: 1241-1259

ISSN (print): 1364-5021

ISSN (electronic): 1471-2946

Publisher: Royal Society Publishing

URL: http://dx.doi.org/10.1098/rspa.2002.1073

DOI: 10.1098/rspa.2002.1073


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