Parameter dependences of convection-driven dynamos in rotating spherical fluid shells

Busse, F.H. and Simitev, R. (2006) Parameter dependences of convection-driven dynamos in rotating spherical fluid shells. Geophysical and Astrophysical Fluid Dynamics, 100(4-5), pp. 341-361. (doi:10.1080/03091920600784873)

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Publisher's URL: http://dx.doi.org/10.1080/03091920600784873

Abstract

For the understanding of planetary and stellar dynamos, an overview of the major parameter dependences of convection driven dynamos in rotating spherical fluid shells is desirable. Although the computationally accessible parameter space is limited, earlier work is extended with emphasis on higher Prandtl numbers and uniform heat flux condition at the outer boundary. The transition from dynamos dominated by non-axisymmetric components of the magnetic field to those dominated by the axisymmetric components depends on the magnetic Prandtl number as well as on the ordinary Prandtl number for higher values of the rotation parameter τ. The dependence of the transition on the latter parameter is also discussed. A variety of oscillating dynamos is presented and interpreted in terms of dynamo waves, standing oscillation or modified relaxation oscillations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Busse, F.H., and Simitev, R.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Geophysical and Astrophysical Fluid Dynamics
ISSN:0309-1929
ISSN (Online):1029-0419

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