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Mechanisms of planetary and stellar dynamos

Published online by Cambridge University Press:  18 July 2013

Emmanuel Dormy ,
Ludovic Petitdemange  and
Martin Schrinner
Emmanuel Dormy
Affiliation:
CNRS, Equipe MAG (ENS-IPGP), LRA, Département de Physique, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France email: [email protected]
Ludovic Petitdemange
Affiliation:
CNRS, Equipe MAG (ENS-IPGP), LRA, Département de Physique, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France email: [email protected]
Martin Schrinner
Affiliation:
CNRS, Equipe MAG (ENS-IPGP), LRA, Département de Physique, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France email: [email protected]
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Abstract

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We review some of the recent progress on modeling planetary and stellar dynamos. Particular attention is given to the dynamo mechanisms and the resulting properties of the field. We present direct numerical simulations using a simple Boussinesq model. These simulations are interpreted using the classical mean-field formalism. We investigate the transition from steady dipolar to multipolar dynamo waves solutions varying different control parameters, and discuss the relevance to stellar magnetic fields. We show that owing to the role of the strong zonal flow, this transition is hysteretic. In the presence of stress-free boundary conditions, the bistability extends over a wide range of parameters.

Keywords

MHDDynamoMagnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 163 - 173
Copyright
Copyright © International Astronomical Union 2013 

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