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Issue A&A
Volume 365, Number 3, January III 2001
Page(s) 562 - 570
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20000141



A&A 365, 562-570 (2001)
DOI: 10.1051/0004-6361:20000141

On the transport of magnetic fields by solar-like stratified convection

S. B. F. Dorch1 and Å. Nordlund2

1  The Royal Swedish Academy of Sciences, Stockholm Observatory, 13336 Saltsjöbaden, Sweden
2  The Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark

(Received 23 June 2000 / Accepted 26 September 2000)

Abstract
The interaction of magnetic fields and stratified convection was studied in the context of the solar and late type stellar dynamos by using numerical 3D MHD simulations. The topology of stratified asymmetric and over-turning convection enables a pumping mechanism that may render the magnetic flux storage problem obsolete. The inclusion of open boundary conditions leads to a considerable flux loss unless the open boundary is placed close to the physical boundary. Simulations including solar-like latitudinal shear indicates that a toroidal field of several tens of kilo-Gauss may be held down by the pumping mechanism.


Key words: Sun: MHD -- magnetic fields -- stratified convection -- activity-rotation: stars -- magnetic fields

Offprint request: S. B. F. Dorch




© ESO 2001


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