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The effects of vertical outflows on disk dynamos

Lookup NU author(s): Dr Anne Bardou, Dr Brigitta von Rekowski, Dr Wolfgang Dobler, Professor Axel Brandenburg, Professor Anvar ShukurovORCiD

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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 the velocity is not too strong. In the nonlinear regime this can lead to super-exponential growth of the magnetic field.

Publication metadata

Author(s): Bardou A, Von Rekowski B, Dobler W, Brandenburg A, Shukurov A

Publication type: Article

Publication status: Published

Journal: Astronomy and Astrophysics

Year: 2001

Volume: 370

Issue: 2

Pages: 635-648

Print publication date: 01/05/2001

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1051/0004-6361:20010267

DOI: 10.1051/0004-6361:20010267

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