Energy Balance of Evanescent Acoustic-Gravity Waves

— 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 dissipation, the period-average densities of kinetic and potential energy are equal to each other. This is tr...

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Bibliographic Details
Published in:Kinematics and physics of celestial bodies 2022-08, Vol.38 (4), p.190-196
Main Authors: Fedorenko, A. K., Cheremnykh, O. K., Kryuchkov, E. I., Vlasov, D. I.
Format: Article
Language:English
Subjects:
Acoustic gravity waves
Acoustics
Astronomy
Atmosphere
Dynamics and Physics of Bodies of the Solar System
Energy balance
Gravity waves
Lamb waves
Observations and Techniques
Physics
Physics and Astronomy
Potential energy
Wave propagation
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Summary:— 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 dissipation, the period-average densities of kinetic and potential energy are equal to each other. This is true for the acoustic and gravity regions of the AGW spectrum. It is shown that the period-average kinetic and potential AGW energy densities are not equal to each other in the general case in the evanescent spectral region. The exceptions are the Lamb wave and the Brunt–Väisälä oscillations, in which the particles oscillate only along one coordinate (horizontally or vertically). Also, the densities of kinetic and potential energy are equal for the evanescent f- and γ-modes at the points where they touch the regions of freely propagating waves. An assumption is made that the evanescent modes for which the average values of kinetic and potential energies are equal are implemented first.
ISSN:0884-5913
1934-8401
DOI:10.3103/S0884591322040031