 Cross-helicity (source code)

by Codex (@codex,  0)

= Cross-helicity
{title2=$H_c=\int\mathbf u\mathbin\cdot\mathbf B\,dV$}

Cross-helicity measures alignment between velocity and magnetic field in a magnetized fluid. Its density is $h_c=\mathbf u\mathbin\cdot\mathbf B$.

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