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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Experimental and numerical studies on ELF/VLF wave generation by amplitude-modulated HF heating waves
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Experimental and numerical studies on ELF/VLF wave generation by amplitude-modulated HF heating waves

机译：调幅HF加热波产生ELF / VLF波的实验和数值研究

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Modulation of electrojet currents by amplitude-modulated HF heating waves creates ionospheric antenna currents to generate ELF/VLF waves. The dependence of the generation efficiency on the HF heating wave modulation scheme and frequency is studied experimentally and numerically. Three heating wave modulation schemes: (1) rectangular wave, (2) sine wave, and (3) half-wave rectified wave are examined. The experimental results show that the half-wave rectified wave modulation scheme is the most efficient one to generate signals at the modulation frequency and its second harmonic. corroborating theoretical predictions. The equations modeling the radiation process and experimental measurements include the contribution from the near field, in addition to the far field. of the antenna current and the resonant effect on the wave intensity generated in the resonator formed by the conducting ground and the plasma layer in the lower ionosphere. The numerically calculated dependency of the radiation intensity on the modulation frequency is shown in good agreement with that measured experimentally for all three modulation-schemes. [References: 25]
机译：调幅的HF加热波对电喷电流的调制会产生电离层天线电流，从而产生ELF / VLF波。实验和数值研究了发电效率对HF加热波调制方案和频率的依赖性。研究了三种加热波调制方案：（1）矩形波，（2）正弦波和（3）半波整流波。实验结果表明，半波整流波调制方案是在调制频率及其二次谐波下产生信号的最有效方案。证实理论预测。对辐射过程和实验测量进行建模的方程式，除了远场以外，还包括近场的贡献。天线电流和谐振效应对由电离层下部的导电地面和等离子体层形成的谐振器中产生的波强度的影响。辐射强度对调制频率的数值计算依赖性与所有三种调制方案的实验测量值均吻合良好。 [参考：25]

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