= Mean-field dynamo
= Mean-field dynamo theory
{synonym}
A mean-field dynamo evolves a slowly varying spatially averaged <magnetic field>. Correlations of fluctuating velocity and magnetic field supply a <mean-field electromotive force>. Its local linear response includes the <alpha effect>; gradients of the mean field can contribute additional transport terms. The distinction between a uniform test field used to measure a response coefficient and a spatially varying mean field used to obtain growth is essential.
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