Volume 461, Number 1, January I 2007
|Page(s)||295 - 301|
|Published online||26 September 2006|
Stability of toroidal magnetic fields in the solar tachocline
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, Germany e-mail: email@example.com
Accepted: 4 September 2006
The stability of toroidal magnetic fields in the radiative interior of the Sun is studied in a three-dimensional environment. The underlying differential rotation in the tachocline depends on both latitude and radius. We found stability limits for toroidal fields of only 100 G even in the simplified, incompressible, but stably stratified case. Nonaxisymmetric modes are linearly unstable with a weak influence on the amplitude of the underlying differential rotation. We conclude that the tachocline is not a suitable location for the storage of magnetic fields as strong as 100 kG. Since the results are based on an extrapolation of the numerical computations to lower solar diffusivities, high-resolution calculations at higher magnetic Reynolds numbers are required.
Key words: Sun: magnetic fields / instabilities / Sun: rotation / magnetic fields / magnetohydrodynamics (MHD)
© ESO, 2006
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