大气声重波的激发

Excitation of Acoustic Gravity Waves

本文讨论三种重要的大气声重波的激发机制,即冲击波激发的大气声重力波;火球/烟云到达稳定高度时,在平衡点附近振荡激发的声重波;以及流体动力源激发的大气声重力波。本文还提出了计算有限时间脉冲的冲击波源在真实大气中激发和传播声重力波的模拟方法,给出三种源的计算机模拟结果和估计它对无线电波传播的影响。

In this paper,three important mechanisms excitiny acoustic gravith waves,including the shock wave produced by the nuclear explosion,the fire ball/smoke cloud oscillation at the vicinity of equilibrum height,and the hydrodynamical source during the thunderstrom as well as the at- mospheric strong convection in the troposphere,are discussed.We developed a simulation method which is used to compute excitation and propagation of the acoustic gravity wave produced by the shock wave with a limited time pulse.Three computed results are given and effects on radio wave propagation are estimated.