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ABBREVIATION for very low frequency 超低频
By analyzing transmission pathway and mode of VLF radio wave, calculation formula of field intensity is given.
分析甚低频电磁波传播路径与方式，给出场强的计算公式。
The propagation effect of VLF wave could become a useful tool of detecting the intensity variation of cosmic rays.
所以，VLF波的传播效应可能成为间接探测宇宙线强度变化的有用工具。
The propagation characteristic of the VLF in the earth-ionosphere waveguide is analyzed by applying the FDTD method.
应用时域有限差分（FDTD）方法分析甚低频在地电离层波导中的传播特性。
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