By using two-dimensional particle-in-cell simulations, we demonstrate a terahertz (THz) wave propagating in the stagnation region of a reentry plasma sheath. When a THz wave propagates in the plasma sheath, the frequency blue shift is initiated as the wavelength is compressed. Attenuation is observed due to energy transfer from the THz wave to the plasma internal energy. Electrons are first accelerated mostly via oscillating in the electric field and partially via the wake field and then deliver their energies to the other particles via collisions. Detailed discussions show that increasing the intensity and frequency of the THz wave results in a higher transmission coefficient, which indicates that high power and high frequency methods are useful for communication blackout mitigation. This investigation of THz wave transmission in plasma will facilitate the mitigation of radio frequency blackout in spacecraft reentry in earth’s atmosphere communication.

中文翻译：

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再入等离子体鞘层停滞区太赫兹波的传播

通过使用二维细胞内粒子模拟，我们展示了在折返等离子体鞘的停滞区域中传播的太赫兹 (THz) 波。当太赫兹波在等离子体鞘中传播时，随着波长的压缩，频率蓝移开始。由于从太赫兹波到等离子体内能的能量转移，观察到衰减。电子首先主要通过在电场中的振荡和部分通过尾流场加速，然后通过碰撞将它们的能量传递给其他粒子。详细讨论表明，增加太赫兹波的强度和频率会导致更高的传输系数，这表明高功率和高频方法对于缓解通信停电是有用的。