Volume 381, Number 3, JanuaryIII 2002
|Page(s)||923 - 932|
|Section||Interstellar and circumstellar matter|
|Published online||15 January 2002|
Dynamo action by differential rotation in a stably stratified stellar interior
Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching, Germany
Corresponding author: email@example.com
Accepted: 18 October 2001
Magnetic fields can be created in stably stratified (non-convective) layers in a differentially rotating star. A magnetic instability in the toroidal field (wound up by differential rotation) replaces the role of convection in closing the field amplification loop. Tayler instability is likely to be the most relevant magnetic instability. A dynamo model is developed from these ingredients, and applied to the problem of angular momentum transport in stellar interiors. It produces a predominantly horizontal field. This dynamo process is found to be more effective in transporting angular momentum than the known hydrodynamic mechanisms. It might account for the observed pattern of rotation in the solar core.
Key words: magnetohydrodynamics (MHD) / stars: magnetic fields / instabilities
© ESO, 2002
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