Can turbulent plane-shear flows support large-scale dynamos?

Details Can turbulent plane-shear flows support large-scale dynamos? Can turbulent plane-shear flows support large-scale dynamos?

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329..722k&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 7, p.722

Astronomy and Astrophysics

Astronomy

2

Magnetohydrodynamics (Mhd), Magnetic Fields

Scientific paper

Turbulent plane-shear flow is found to show same basic effects of mean-field MHD as rotating turbulence. In particular, the mean electromotive force (EMF) includes highly anisotropic turbulent diffusion and alpha-effect. Only magnetic diffusion remains for spatially-uniform turbulence. The question is addressed whether in this case a self-excitation of a magnetic field by so-called sher-current dynamo is possible and the quasilinear theory provides a negative answer. The stream-aligned component of the EMF has the sign opposite to that required for dynamo. If, however, the turbulence is not uniform across the flow direction then a dynamo-active α-effect emerges. The critical magnetic Reynolds number for the alpha-shear dynamo is estimated to be slightly above ten. Possibilities for cross-checking theoretical predictions with MHD experiments are discussed.

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