Evanescent acoustic-gravity wave modes in the non-isothermal atmosphere
| 1Cheremnykh, OK, 1Fedorenko, AK, Vlasov, DI, Melnychuk, SV 1Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2021, 37(4):3-17 |
| https://doi.org/10.15407/kfnt2021.04.003 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Язык: Ukrainian |
Аннотация: The propargation of evanescent acoustic-gravity waves in the atmosphere with a casual altitude temperature profile was researched. We found that two types of evanescent wave modes can exist in the vertically nonisothermal atmosphere. The first type is the f-mode which dispersion doesn’t depend from the altitude inhomogeneity of temperature so it is carried out at any altitude level of the nonisothermal atmosphere. The second type is a recently discovered γ-mode which dispertion depends from the altitude temperature gradient in a non-isothermal atmosphere so it can be performed only at certain altitude intervals. We investigated the possibility of realizing the f- and γ-mode(s) in the Earth’s atmosphere taking into account the model altitude temperature profile. In this paper was found that these modes can exist at the altitude of local temperature extremes in the atmosphere. Moreover these modes are realized only in a narrow range of spectral parameters for which the conditions of a decrease in the wave energy above and below the level of their propagation are satisfied. Recommendations regarding the possibility of observing these modes in the atmosphere of the Earth and the Sun are given. The f-mode can presumably be observed near the mesopause with a characteristic wavelength λx ≈ 75 km at the Earth’s atmosphere and at the heights of the chromosphere with wavelength λx ≈ 1600 km at the solar atmosphere. The period of the f-mode that propagates in the region of the minimum temperature should be slightly exceed the Brent-Vaisala period at this height. The γ-mode can be observed at the regions of maximum temperature (for example: at the height of the stratopause) with a characteristic wavelength λx ≈ 100 km in the Earth’s atmosphere. The period of γ-mode should be slightly longer than the period of Brent-Vaisala at the height of its implementation. |
| Ключевые слова: acoustic gravity wave, evanescent wave mode, non-isothermal atmosphere |
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