Omega effect
= Omega effect
{c}
{title2=$\partial_tB_{\rm tor}\sim\Omega B_{\rm pol}$}
Differential rotation or shear stretches a <poloidal magnetic field> into a <toroidal magnetic field>. This is the Omega effect. By itself it need not regenerate the poloidal component; the <alpha effect> provides one possible feedback mechanism in an <alpha-Omega dynamo>. Without feedback, shear amplification can be transient or algebraic rather than sustained exponential <dynamo action>.