The effects of vertical outflows on disk dynamos

Citation
A. Bardou et al., The effects of vertical outflows on disk dynamos, ASTRON ASTR, 370(2), 2001, pp. 635-648
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
2
Year of publication
2001
Pages
635 - 648
Database
ISI
SICI code
0004-6361(200105)370:2<635:TEOVOO>2.0.ZU;2-U
Abstract
We consider the effect of vertical outflows on the mean-field dynamo in a t hin disk. These outflows could be due to winds or magnetic buoyancy. We ana lyse both two-dimensional finite-difference numerical solutions of the axis ymmetric dynamo equations and a free-decay mode expansion using the thin-di sk approximation. Contrary to expectations, a vertical velocity can enhance dynamo action! provided the velocity is not too strong. In she nonlinear r egime this can lead to super-exponential growth of the magnetic field.