Volume 552, April 2013
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||04 April 2013|
Stability of the toroidal magnetic field in rotating stars
INAF, Osservatorio Astrofisico di Catania, via S.Sofia 78, 95123
2 INFN, Sezione di Catania, via S.Sofia 72, 95123 Catania, Italy
3 A.F.Ioffe Institute of Physics and Technology, 194021 St. Petersburg, Russia
4 Isaac Newton Institute of Chile, Branch in St. Petersburg, 194021 St. Petersburg, Russia
Accepted: 22 January 2013
The magnetic field in stellar radiation zones can play an important role in phenomena such as mixing, angular momentum transport, etc. We study the effect of rotation on the stability of a predominantly toroidal magnetic field in the radiation zone. In particular we considered the stability in spherical geometry by means of a linear analysis in the Boussinesq approximation. It is found that the effect of rotation on the stability depends on a magnetic configuration. If the toroidal field increases with the spherical radius, the instability cannot be suppressed entirely even by a very fast rotation. Rotation can only decrease the growth rate of instability. If the field decreases with the radius, the instability has a threshold and can be completey suppressed.
Key words: instabilities / magnetohydrodynamics (MHD) / stars: interiors / stars: magnetic field / Sun: interior
© ESO, 2013
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