Magnetic axial angular momentum flux
= Magnetic axial angular momentum flux
{title2=$\mathbf F_{J,p}=-RB_\phi\mathbf B_p/\mu_0$}
The <magnetic tension> stress transports axial <angular momentum> along a <poloidal magnetic field>. In purely azimuthal ideal flow the poloidal energy flux is $\mathbf F_{E,p}=\Omega\mathbf F_{J,p}$. This proportionality is valid even at vanishing flux, where an ordinary ratio is undefined. The coupled fluxes explain how a <torsional Alfvén wave> redistributes rotation.