Cold-plasma right-handed wave ($n^2=R=S-g$)

For propagation along $+{\mathbf{B}}_0$, use $e^{ikz-i\omega t}$ and ${ϵ}_{xy}=ig$. This transverse electromagnetic wave has $E_y=i{E}_x$ and refractive index $n^2=S-g$. Its real electric field rotates in the sense of electron gyration. With immobile ions and positive electron cyclotron frequency magnitude ${\Omega }_e$, $R=1-{\omega }_{pe}^2/[\omega (\omega -{\Omega }_e)]$.