Infrasound propagation through the atmosphere with mesoscale wind velocity and temperature fluctuationsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 8 июня 2022 г.
Аннотация:Some results on modeling and observation of infrasound propagation
in the atmosphere in a presence of mesoscale and anisotropic
wind velocity and temperature fluctuations are presented. The theoretical
model of infrasound scattering from anisotropic wind velocity
and temperature inhomogeneities of the atmosphere is developed.
With this model, the appearance of the stratospheric, mesospheric,
and thermospheric arrivals of the infrasound signals in the acoustic
shadow zones is explained. The analytic relation between the
wave field of the scattered infrasound signal and the vertical profile of the effective sound speed fluctuations is obtained. Using this relation, the vertical profiles of the fluctuations within the upper stratosphere (25–55 km) and the lower thermosphere (105–140 km) were retrieved from the waveforms and travel times of the signals
recorded in the acoustic shadow zones. The theoretical frequency spectrum of the infrasound wavefield reflected from the fine-scale layered structure of the atmosphere is obtained and compared with the spectra of the observed stratospheric arrivals.