A differential rotation driven dynamo in a stably stratified star

Details A differential rotation driven dynamo in a stably stratified star A differential rotation driven dynamo in a stably stratified star

2005-09-22

arxiv.org/abs/astro-ph/0509693v1

Astronomy and Astrophysics

Astrophysics

Submitted to A&A

Scientific paper

10.1051/0004-6361:20054241

We present numerical simulations of a self-sustaining magnetic field in a differentially rotating non-convective stellar interior. A weak initial field is wound up by the differential rotation; the resulting azimuthal field becomes unstable and produces a new meridional field component, which is then wound up anew, thus completing the `dynamo loop'. This effect is observed both with and without a stable stratification. A self-sustained field is actually obtained more easily in the presence of a stable stratification. The results confirm the analytical expectations of the role of Tayler instability.

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