Field of point source of lowfrequency sound in atmosphere with altitudinally nonuniform wind
Abstract
The problem of propagation of infrasonic waves from a point source through a stratified moving atmosphere is solved almost exactly, analytically, or the case of an altitudinally nonuniform purely horizontal wind. The harmonic point source is assumed to be close to or on the ground and the wind velocity is assumed to vary vertically with an exponential profile Vx(2)c = V(0)c (13 to the 2/h power) (Vhorizontal wind velocity; c acoustic velocity, h characteristic scale of altitudinal wind nonuniformity). The corresponding equation for the quasipotential velocity is solved for the altitudinal amplitude profiles of the zeroorder normal wave in a narrow atmospheric waveguide (k(0)h = 1) and in a wide atmospheric waveguide (k(0)h = 2 pi), as well as of the thirdorder normal wave (k(0)h = 22) and the sixthorder normal wave (k(0)h = 40). From the solution is also determined the dependence of the wave field amplitude and phase on the distance from the source. Results are based on k(0)h V x/c (k(0)  wave number) and V(x) c, with h = 30 m (approximately the wavelength of sound).
 Publication:

USSR Rept Electron Elec Eng JPRS UEE
 Pub Date:
 March 1985
 Bibcode:
 1985RpEEE........1C
 Keywords:

 Acoustic Velocity;
 Atmospheric Attenuation;
 Infrasonic Frequencies;
 Low Frequencies;
 Wind (Meteorology);
 Numerical Analysis;
 Point Sources;
 Waveguides;
 Wavelengths;
 Acoustics