| Issue |
A&A
Volume 477, Number 1, January I 2008
|
|
|---|---|---|
| Page(s) | 35 - 41 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20077476 | |
| Published online | 26 October 2007 | |
Stability of magnetic configurations containing the toroidal and axial fields
1
INAF – Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy e-mail: abo@oact.inaf.it
2
INFN, Sezione di Catania, via S. Sofia 72, 95123 Catania, Italy
3
A.F. Ioffe Institute of Physics and Technology and Isaac Newton Institute of Chile, Branch in St. Petersburg, 194021 St. Petersburg, Russia
Received:
14
March
2007
Accepted:
18
September
2007
Stability properties of magnetic-field configurations containing the
toroidal and axial field are considered.
The stability is treated by making use of linear analysis.
It is shown that the conditions required
for the onset of instability are essentially different from those
given by the necessary condition 
, where s is the
cylindrical radius. The growth rate of instability is calculated for a wide
range of the parameters. We argue that the instability can operate in two
different regimes depending on the strength of the axial field and the
profile of the toroidal field.
Key words: magnetohydrodynamics (MHD) / instabilities / stars: magnetic fields
© ESO, 2007
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