= Pressure-balanced plasma perturbation
{title2=$\delta p_\perp+B_0\delta B/(4\pi)=0$}
A low-<frequency>, strongly oblique <plasma> perturbation in which perpendicular <magnetic pressure> equilibrates rapidly compared with the retained dynamics. In <Gaussian units>, its leading total transverse <pressure> perturbation vanishes as shown. Thus $\delta B/B_0=-(\beta/2)\delta p_\perp/p_0$, where $\beta$ is <plasma beta>. A small fractional <magnetic field> perturbation can still exert a leading <force>.
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