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Title:
The effects of vertical outflows on disk dynamos.
Authors:
Bardou, A.; von Rekowski, B.; Dobler, W.; Brandenburg, A.; Shukurov, A.
Affiliation:
AA(Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK), AB(Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK), AC(Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK), AD(Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK), AE(Nordita, Blegdamsvej 17, 2100 Copenhagen, Denmark)
Publication:
Astronomy and Astrophysics, v.370, p.635-648 (2001) (A&A Homepage)
Publication Date:
05/2001
Origin:
A&A
Astronomy Keywords:
ACCRETION, ACCRETION DISKS, MAGNETIC FIELDS, GALAXIES: MAGNETIC FIELDS
DOI:
10.1051/0004-6361:20010267
Bibliographic Code:
2001A&A...370..635B

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.
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