Dynamo action associated with random waves in a rotating stratified fluid

Details Dynamo action associated with random waves in a rotating stratified fluid Dynamo action associated with random waves in a rotating stratified fluid

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jfm....96..207w&link_type=abstract

Journal of Fluid Mechanics, vol. 96, Jan. 16, 1980, p. 207-222.

Physics

20

Conducting Fluids, Dynamo Theory, Magnetohydrodynamic Waves, Rotating Fluids, Solar Physics, Stratified Flow, Atmospheric Stratification, Electric Fields, Electrodynamics, Fourier Analysis, Rotating Plasmas, Tensor Analysis, Turbulent Flow

Scientific paper

A random superposition of waves in a rotating, stratified, electrically conducting fluid leads to dynamo action in the sense that it yields a mean electric field having a component parallel to the mean magnetic field ('alpha-effect'). Using Fourier analysis methods, an explicit expression for the mean electric field is derived. The alpha-effect has tensor form. A finite alpha-tensor even in a case of vanishing mean helicity is obtained. The result is discussed in the context of the solar turbulent dynamo.

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