大振幅HF无线电波与电离层相互作用的模拟研究
Simulation study of the interaction between large-amplitude HF radio waves and the ionosphere
摘要：
数值研究了垂直注入架空电离层的大振幅电磁波的时间演化。EM波具有5 MHz的载波频率，并且被调制为高斯脉冲，其宽度约为0.1毫秒，并且在50 km处的真空振幅为1.5 V/m。这是从地面上的典型高功率HF广播站发射的调制无线电波的公平表示。脉冲通过中性大气传播到电离层的临界点，在那里L-O和R-X模式被反射，并返回中性大气。我们观察到模式转换的L-O模式的静电波，以及谐波产生的转折点的R-X和L-O模式，在那里他们的振幅上升到原来的几倍。该研究与地面和卫星或火箭观测相结合，对电离层相互作用实验具有相关性。
英文摘要：
The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 V/m at 50 km. This is a fair representation of a modulated radio wave transmitted from a typical high-power HF broadcast station on the ground. The pulse is propagated through the neutral atmosphere to the critical points of the ionosphere, where the L-O and R-X modes are reflected, and back to the neutral atmosphere. We observe mode conversion of the L-O mode to electrostatic waves, as well as harmonic generation at the turning points of both the R-X and L-O modes, where their amplitudes rise to several times the original ones. The study has relevance for ionospheric interaction experiments in combination with ground-based and satellite or rocket observations.
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