Instability of the critical surface of a laser-produced plasma in the presence of ion-acoustic turbulence

The critical surface can be unstable to coherent rippling perturbations due to the action of negative pressure induced by the random magnetic field associated with ion-acoustic turbulence. The negative magnetic pressure occurs if there exists a preferential orientation of the random magnetic field (anisotropy of the ion-acoustic turbulence) when the nonpotential component of the magnetic pressure more than compensates the potential part.