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A first model of stable magnetic configuration in stellar radiation zones

Published online by Cambridge University Press:  08 June 2011

Vincent Duez ,
Jonathan Braithwaite  and
Stéphane Mathis
Vincent Duez
Affiliation:
Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53111 Bonn, Germany, email: vduez@astro.uni-bonn.de, jonathan@astro.uni-bonn.de
Jonathan Braithwaite
Affiliation:
Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53111 Bonn, Germany, email: vduez@astro.uni-bonn.de, jonathan@astro.uni-bonn.de
Stéphane Mathis
Affiliation:
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/SAp Centre de Saclay, F-91191 Gif-sur-Yvette, France, email: stephane.mathis@cea.fr
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Abstract

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We test the stability of a magnetic equilibrium configuration using numerical simulations and semi-analytical tools. The tested configuration is, as described by Duez & Mathis (2010), the lowest energy state for a given helicity in a stellar radiation zone. We show using 3D magneto-hydrodynamic (MHD) simulations that the present configuration is stable with respect to all submitted perturbations, that would lead to the development of kink-type instabilities in the case of purely poloidal or toroidal fields, both well known to be unstable. We also discuss, using semi-analytic work, the stabilizing influence of one component on the other and show that the found configuration actually lies in the stability domain predicted by a linear analysis of resonant modes.

Keywords

stars: magnetic fieldsMHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 467 - 469
Copyright
Copyright © International Astronomical Union 2011

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