= Mean-field electromotive force
{title2=$\boldsymbol{\mathcal E}=\langle\mathbf u\times\mathbf b\rangle$}
= Mean electromotive force
{synonym}
The <mean-field electromotive force> is the vector correlation $\boldsymbol{\mathcal E}=\langle\mathbf u\times\mathbf b\rangle$. Its <curl> enters the mean <resistive induction equation>. It is a local vector with units of <velocity> times <magnetic field>, not the scalar circuit voltage called <electromotive force>. A <space-time average of periodic modes> is often used to measure its transport coefficients.
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