The electromagnetic propagation characteristics of plasma under traveling magnetic fields

The application of traveling magnetic fields for communication blackout mitigation introduces significant temporal variations in plasma magnetization characteristics. However, the traditional electromagnetic propagation model does not consider this time-varying magnetization effect, which leads to calculation errors. To address this challenge, this paper presents an enhanced current density convolution finite-difference time-domain algorithm that incorporates two critical advancements: the influence of traveling-wave magnetic fields on the electron density distribution and time-dependent magnetization effects in plasma. The improved methodology enables the comprehensive simulation of oblique electromagnetic wave incidence and wave-plasma interactions under traveling magnetic field excitation. Using the electron-density distribution model of plasma under a traveling magnetic field, an electromagnetic wave propagation model is constructed for scenarios where electromagnetic waves are obliquely incident on plasma influenced by a traveling magnetic field. The electromagnetic propagation characteristics of such electromagnetic waves are calculated. The results indicate that the transmission coefficient of the electromagnetic waves exhibits periodic variation over time. In addition, the transmission coefficient of the electromagnetic waves decreases as the angle of incidence increases.