Energy balance of evanescent acoustic-gravity waves

Heading: 
Dynamics and Physics of Solar System Bodies
1Fedorenko, AK, 1Cheremnykh, OK, Kryuchkov, EI, Vlasov, DI
1Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2022, 38(4):17-28
https://doi.org/10.15407/kfnt2022.04.017
Start Page: Dynamics and Physics of Solar System Bodies
Language: Ukrainian
Abstract: 

The features of the energy balance of evanescent acoustic-gravity waves in the atmosphere are investigated. In the case of freely propagating AGWs in an ideal isothermal atmosphere (without taking into account dissipation and sources), the average values of the kinetic and potential energy densities are equal to each other over the period. This is true for the acoustic and gravity regions of the acoustic-gravity spectrum. It is shown that, in the evanescent region of the spectrum the average values of the density of the kinetic and potential energies of AGWs over the period are not equal to each other in the general case. The exceptions are the Lamb wave and the Brent-Väisälä oscillations, in which the particles oscillate only along one coordinate (horizontally or vertically). In addition, the kinetic and potential energy densities are equal for the f- and ℽ-modes at the points where they touch the regions of freely propagating waves. An assumption is made regarding the prevailing realization of those evanescent regimes for which the equality of the average values of the kinetic and potential energies is fulfilled.

Keywords: acoustic-gravity wave, energy balance, evanescent wave mode

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