Abstract
The propagation of atmospheric gravity waves (AGWs) is studied in the context of geometrical optics in the nonisothermal, viscous, and thermal-conductive atmosphere of Earth in the presence of wind shifts. Parametric diagrams are plotted, determining the regions of allowed frequencies and horizontal phase velocities of AGWs depending on the altitude. It is shown that a part of the spectrum of AGWs propagates in stationary air in an altitude range from the Earth’s surface through the ionospheric F1 layer. AGW from nearearth sources attenuate below 250 km, while waves generated at altitudes of about 300 km and higher do not reach the Earth’s surface because of the inner reflection from the thermosphere base. The pattern changes under strong thermospheric winds. AGW dissipation decreases with an adverse wind shift and, hence, a part of the wave spectrum penetrated from the lower atmosphere to the altitudes of F2 layer.
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Original Russian Text © G.V. Lizunov, A.Yu. Leont’ev, 2014, published in Geomagnetizm i Aeronomiya, 2014, Vol. 54, No. 6, pp. 834–841.
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Lizunov, G.V., Leont’ev, A.Y. Ranges of AGW propagation in the Earth’s atmosphere. Geomagn. Aeron. 54, 841–848 (2014). https://doi.org/10.1134/S0016793214050089
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DOI: https://doi.org/10.1134/S0016793214050089