| Issue |
A&A
Volume 370, Number 2, May I 2001
|
|
|---|---|---|
| Page(s) | 635 - 648 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20010267 | |
| Published online | 15 May 2001 | |
The effects of vertical outflows on disk dynamos
1
Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
2
Nordita, Blegdamsvej 17, 2100 Copenhagen, Denmark
Corresponding author: A. Bardou, Anne.Bardou@ncl.ac.uk
Received:
23
November
2000
Accepted:
15
February
2001
We consider the effect of vertical outflows on the mean-field dynamo in a thin disk. These outflows could be due to winds or magnetic buoyancy. We analyse both two-dimensional finite-difference numerical solutions of the axisymmetric dynamo equations and a free-decay mode expansion using the thin-disk approximation. Contrary to expectations, a vertical velocity can enhance dynamo action, provided the velocity is not too strong. In the nonlinear regime this can lead to super-exponential growth of the magnetic field.
Key words: accretion, accretion disks / magnetic fields / galaxies: magnetic fields
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.