Ordinary plasma wave
= Ordinary plasma wave
{title2=$n^2=P$}
= O-mode
{c}
{synonym}
For propagation perpendicular to an equilibrium <magnetic field>, an ordinary <plasma> <wave> has its <electric field> parallel to that <magnetic field>, so the particle response involves no magnetic deflection. With immobile <ions>, the <dispersion relation> is $\omega^2=\omega_{pe}^2+c^2k^2$. It is a transverse <electromagnetic wave>, despite its parallel particle motion.