The effects of vertical outflows on disk dynamos
Astrophysics
2009-10-31 v2
Abstract
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 it is not too strong. In the nonlinear regime this can lead to super-exponential growth of the magnetic field.
Keywords
Cite
@article{arxiv.astro-ph/0011545,
title = {The effects of vertical outflows on disk dynamos},
author = {A. Bardou and B. v. Rekowski and W. Dobler and A. Brandenburg and A. Shukurov},
journal= {arXiv preprint arXiv:astro-ph/0011545},
year = {2009}
}
Comments
14 pages, final version after referee comments, accepted in A&A