太赫兹波斜入射磁化等离子体的传播特性

针对飞行器再入大气的“黑障”问题，基于等离子体电子密度Epstein分布，建立了太赫兹波穿过磁化等离子体鞘套的一维模型。计算了太赫兹波斜入射磁化等离子体鞘套的透射率和衰减；分析了等离子体碰撞频率、磁场强度、入射角等因素对太赫兹波传播特性的影响。研究结果表明，外加磁场强度增大，透射率的最小值和衰减峰值向较高太赫兹波频率方向移动；电磁波入射角变大，透射率变小，衰减变大；当入射角小于等于60°时，大气窗口0.22 THz处最大衰减为5.32 dB。研究结果为解决“黑障”问题提供了重要参考。

Abstract

The communication blackout when the space vehicle at ultra-high speed is reentering the atmosphere has always been a challenging task. Based on the Epstein distribution of electron density, the models of oblique incidence terahertz wave propagation are established for magnetized plasma inhomogeneous plasma sheath. The transmittance and attenuation of terahertz wave are numerically calculated. The effects of collision frequency, magnetic field intensity, incident angle, etc. on THz wave attenuation are analyzed. The results shows that with the increase of magnetic field intensity, the minimum transmittance and attenuation peak move to the direction of higher THz frequency. When the electromagnetic wave incident angle becomes larger, the transmittance decreases, and the attenuation increases. When the incident angle is less than or equal to 60o, the maximum attenuation at 0.22 THz of atmospheric window is 5.32 dB. This study provides a theoretical basis for solving the blackout problem.

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