A simple method has been proposed to determine acoustic-gravity wave (AGW) characteristics at lower ionosphere (mesosphere) heights by measuring VLF radio signal amplitudes. For relatively short radio paths (less than $\sim$ 1500 km long) we obtained the simple relations for estimation of AGW neutral density fluctuation and for vertical displacement of an elementary volume of atmospheric gas. The proposed method has been verified by using VLF radio wave amplitude measurements on several radio paths. AGW properties based on these measurements are approximately calculated at heights of radio signal reflection. The relative fluctuation of 3%–6% of neutral particle concentration and elementary volume displacement of 0.6–1.2 km have been obtained. These results are in good agreement with AGW theory in the Earth atmosphere.

已经提出了一种简单的方法，通过测量VLF无线电信号幅度来确定较低电离层（mesosphere）高度的声重力波（AGW）特性。对于相对短的无线电路径（小于$〜$1500公里长），我们获得了用于估算AGW中性密度波动和大气基本体积垂直位移的简单关系。通过在多个无线电路径上使用VLF无线电波幅度测量值，已验证了所提出的方法。基于这些测量的AGW属性是在无线电信号反射的高度近似计算的。获得了中性粒子浓度的3％–6％的相对波动和0.6–1.2 km的基本体积位移。这些结果与地球大气中的AGW理论非常吻合。