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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.
Author(s): Urpin V
Publication type: Review
Publication status: Published
Journal: Astronomy and Astrophysics
Print publication date: 01/01/1999
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746