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Astron. Astrophys. 338, L55-L58 (1998)
Letter to the Editor
Simulations of an alpha-effect due to magnetic buoyancy
Axel Brandenburg 1 and
Dieter Schmitt 2
1 Department of Mathematics, University of Newcastle upon
Tyne, NE1 7RU, UK
2 Universitäts-Sternwarte Göttingen,
Geismarlandstrasse 11, D-37083 Göttingen, Germany
Received 20 July 1998 / Accepted 20 August 1998
Abstract
Three-dimensional simulations of a thermally stably stratified gas
with a localized layer of toroidal magnetic field are carried out. The
magnetic field gives rise to a magnetic buoyancy instability. Due to
the presence of rotation the resulting fluid motions are helical and
lead to an ![[FORMULA]](img1.gif)
-effect, i.e. to a component of the
electromotive force in the direction of the mean magnetic field. The
value of is estimated during the exponential
growth phase of the instability. The mean vertical transport velocity
of the magnetic field is also calculated. It is found that
varies with latitude and its value is positive
in the northern hemisphere.
Key words: Sun: magnetic
fields 
magnetohydrodynamics
dynamo
instabilities
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. The model
- 3. Results
- 4. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 1998
Online publication: September 14, 1998
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