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This paper extends current knowledge on electromagnetic wave scattering frombounded moving media in several regards. First, it complements the usualdispersion relation of moving media, $\omega(\theta_\mathbf{k})$($\theta_\mathbf{k}$: phase velocity direction, associated with the wavevector, $\mathbf{k}$), with the equally important impedance relation,$\eta(\theta_\mathbf{S})$ ($\theta_\mathbf{S}$: group velocity direction,associated with the Poynting vector, $\mathbf{S}$). Second, it explains theinterluminal-regime phenomenon of double-downstream wave transmission across astationary interface between a regular medium and the moving medium, assumingmotion perpendicular to the interface, and shows that the related waves aresymmetric in terms of the energy refraction angle, while being asymmetric interms of the phase refraction angle, with one of the waves subject to negativerefraction, and shows that the wave impedances of the two transmitted waves areequal. Third, it generalizes the problem to the case where the medium movesobliquely with respect to the interface. Finally, it highlights the connectionbetween this problem and a spacetime modulated medium.

Wave Scattering in Moving Media across the Subluminal-Interluminal Regimes