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Mean electromotive force and dynamo action in a turbulent flow

Lookup NU author(s): Dr Vadim Urpin


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We derive the expression for the mean electromotive force in a turbulent flow taking into account stretching of turbulent magnetic field lines and streamlines by the mean flow. Shear stresses break the symmetry of turbulence in such a way that turbulent motions become suitable for the dynamo action. The contribution of this effect to the mean electromotive force is proportional to the production of spatial derivatives of the mean magnetic held and the mean velocity thus it cannot be described, in principle, in terms of the conventional alpha-effect.

Publication metadata

Author(s): Urpin V

Publication type: Review

Publication status: Published

Journal: Astronomy and Astrophysics

Year: 1999

Volume: 347

Issue: 3

Pages: L47-L50

Print publication date: 01/01/1999

ISSN (print): 0004-6361

ISSN (electronic): 1432-0746