Cross-helicity
= 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 $h_c=\mathbf u\mathbin\cdot\mathbf B$.
= 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 $h_c=\mathbf u\mathbin\cdot\mathbf B$.