Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328.1137b&link_type=abstract
Astronomische Nachrichten, Vol.328, Issue 10, p.1137
Astronomy and Astrophysics
Astronomy
7
Instabilities, Sun: Magnetic Fields, Sun: Rotation
Scientific paper
Using the 3-dimensional ASH code, we have studied numerically the instabilities that occur in stellar radiation zones in presence of large-scale magnetic fields, rotation and large-scale shear. We confirm that some configurations are linearly unstable, as predicted by Tayler and collaborators, and we determine the saturation level of the instability. We find that rotation modifies the peak of the most unstable wave number of the poloidal instability but not its growth rate as much as in the case of the m=1 toroidal instability for which it is changed to σ = σ_A2/Ω. Further in the case with rotation and shear, we found no sign of the dynamo mechanism suggested recently by Spruit even though we possess the essential ingredients (Tayler's m=1 instability and a large scale shear) supposedly at work.
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