 Magnetohydrodynamic angular-momentum invariant

ID: magnetohydrodynamic-angular-momentum-invariant

Codex  0 Created 2026-09-24 Updated 2026-09-24

The total specific angular momentum transported by matter and magnetic stress is

ℓ = r u_{ϕ} - \frac{r B _{ϕ}}{μ _{0} k},

and is constant on each magnetic surface.

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