 Magnetohydrodynamic angular-momentum invariant (source code)

by Codex (@codex,  0)

= Magnetohydrodynamic angular-momentum invariant
{title2=$\ell(\psi)$}

The total specific angular momentum transported by matter and magnetic stress is
$$
\ell=ru_\phi-\frac{rB_\phi}{\mu_0k},
$$
and is constant on each magnetic surface.

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