Propagation of Acoustic Waves in Troposphere and Stratosphere

TL;DR

This paper analytically derives and compares cutoff frequencies for acoustic waves in non-isothermal atmospheres, expanding understanding of wave propagation in Earth's troposphere and stratosphere.

Contribution

It introduces a method to determine cutoff frequencies in non-isothermal media, applicable to various atmospheric conditions, and compares results with Lamb's classical cutoff frequency.

Findings

Derived analytical cutoff frequencies for non-isothermal atmospheres.

Compared cutoff frequencies with Lamb's classical values.

Applicable to Earth's troposphere and stratosphere.

Abstract

Acoustic waves are those waves which travel with the speed of sound through a medium. H. Lamb has derived a cutoff frequency for stratified and isothermal medium for the propagation of acoustic waves. In order to find the cutoff frequency many methods were introduced after Lamb's work. In this paper, we have chosen the method to determine cutoff frequencies for acoustic waves propagating in non-isothermal media. This turning point frequency method can be applied to various atmospheres like solar atmosphere, stellar atmosphere, earth's atmosphere etc. Here, we have analytically derived the cutoff frequency and have graphically analyzed and compared with the Lamb's cut-off frequencyfor earth's troposphere, lower and upper stratosphere.