The effects of vertical outflows on disk dynamos

Details The effects of vertical outflows on disk dynamos The effects of vertical outflows on disk dynamos

2000-11-29

arxiv.org/abs/astro-ph/0011545v2

Astron.Astrophys. 370 (2001) 635-648

Astronomy and Astrophysics

Astrophysics

14 pages, final version after referee comments, accepted in A&A

Scientific paper

10.1051/0004-6361:20010267

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.

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