Identification of acoustic-gravity waves from satellite measurements
| Klymenko, YO, 1Fedorenko, AK, Kryuchkov, EI, 1Cheremnykh, OK, Voytsechovska, AD, Selivanov, YO, 1Zhuk, IT 1Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2021, 37(6):3-18 |
| https://doi.org/10.15407/kfnt2021.06.003 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Language: Ukrainian |
Abstract: It is proposed a method for recognizing the types of linear acoustic gravity waves (AGWs) in the atmosphere from satellite measurements. It is shown that the polarization relations between fluctuations of wave parameters (velocity, density, temperature, and pressure) differ significantly for freely propagating waves and evanescent wave modes, which makes it possible to identify different types of atmospheric waves in the experimental data. It is constructed a diagnostic diagram, that allows us to determine the type of the wave, as well as the vertical direction of its propagation based on the phase shifts between parameters observed. Using the phase shifts between fluctuations of the velocity and the atmospheric thermodynamic parameters it can be determined not only the type of the wave, but also its spectral characteristics. The proposed method has been verified for identifying the polar wave disturbances in the measurements from low-orbit satellite Dynamics Explorer 2. The verification has been shown that AGW polarization relations in the thermosphere mainly correspond to the gravity branch of acoustic-gravity waves which are freely propagating from below. This conclusion agrees with the other results of AGW observations in the atmosphere and the ionosphere by ground-based and satellite methods. Evanescent waves on the considered orbits have been not observed. |
| Keywords: acoustic gravity wave, evanescent wave mode, isothermal atmosphere, polarization relations |
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