Research on the propagation properties of THz circularly polarized wave in BGK model inhomogeneous dusty plasma

When a hypersonic vehicle flies near space, a layer of complex dusty plasma will form around the vehicle under the influence of high temperature, which will cause radar signal attenuation (ATT) to different degrees and lead to communication barriers. Therefore, studying the interaction mechanism between electromagnetic waves and dusty plasma is important. In this paper, the Bhatnagar–Gross–Krook collision model of non-uniform dusty plasma is derived on the basis of Boltzmann's approximate equation. In addition, the modified expression of a dielectric coefficient of weakly ionized dusty plasma is obtained under the condition of magnetization. With the Wentzel–Kramers–Brillouin method, the ATT coefficients of terahertz wave with different external magnetic fields and dusty plasma parameters are calculated. Results show that a strong external magnetic field will cause the ATT of the right-hand circular polarized wave to produce a low absorption band, whereas the ATT of the left-hand circular polarized wave will evidently weaken. The electron concentration, dust concentration, dust particle radius, collision frequency, and charging frequency also influence the ATT under the external magnetic field. These studies provide theoretical references for the research on the blackouts of hypersonic vehicles.