Simulating the influence of an atmospheric fine inhomogeneous structure on long-range propagation of pulsed acoustic signals |
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| Authors: | S N Kulichkov I P Chunchuzov O I Popov |
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| Institution: | (1) Oboukhov Institute of Atmospheric Physics , Russian Academy of Sciences, Pyzhevsky 3, Moscow, 119017, Russia |
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| Abstract: | The results of simulating the influence of an atmospheric fine structure on the characteristics of acoustic signals propagating
throughout the atmosphere for long distances from their sources are presented. A numerical model of an atmospheric fine inhomogeneous
structure within the height range z = 20…120 km is proposed to perform calculations. This model and its numerical parameters are based on the current notions
of the formation of an atmospheric fine structure due to internal gravity waves. The numerical calculations were performed
using the parabolic-equation method. A spatial structure of the acoustic field and the structure of an acoustic signal at
long distances from a pulsed source were calculated. It is shown that the presence of an atmospheric fine structure results
in a scattering of acoustic signals and their recording in the geometric shadow region. The results of calculations of signal
forms are in a satisfactory agreement with data on signals recorded in the geometric shadow region which is formed at a distance
of about 300 km from an experimental explosion. |
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