Accession Number:

AD0730700

Title:

Absorption of Low Frequency Sound in a Homogeneous Atmosphere,

Descriptive Note:

Corporate Author:

TEXAS WESTERN COLL EL PASO SCHELLENGER RESEARCH LABS

Personal Author(s):

Report Date:

1959-08-01

Pagination or Media Count:

97.0

Abstract:

This is an elementary review of the classical and molecular theory of the absorption of sound, with particular attention to the absorption of frequencies less than 1000 cps in the atmosphere from sea level to 50 km. The variation of the theoretically predicted absorption with the meteorological parameters--pressure, temperature, and humidity--is investigated. Recent work involving absorption due to radiation is included. The absorption has been calculated for various altitudes, humidities, and frequencies. These data are presented in tabular form in the appendix. Although the absorption varies in a rather complicated manner with the meteorological parameters, it is found to be quite small for the very low frequencies, resulting in a predicted long distance propagation with small attenuation if the geometry of propagation is advantageous. Author

Subject Categories:

  • Atmospheric Physics
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE