Results 231 to 240 of about 56,536 (266)

Harmonic generation of acoustic gravity waves

Journal of Geophysical Research: Space Physics, 1978
We have found that a wave at a particular frequency, which is approximately 0.8 times the Brunt‐Väisälä frequency, may play an outstanding role in second‐harmonic generation of acoustic gravity waves.
L. Stenflo, K. B. Dysthe
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Nonlinear Wave Equations for Low-Frequency Acoustic Gravity Waves

Journal of the Atmospheric Sciences, 1988
It is shown that low-frequency acoustic gravity waves propagating parallel to the earth's surface satisfy the Korteweg-De Vries equation or the Kadomtsev-Petviashvili equation and have a discrete spectrum of group velocities. The atmosphere is considered to be incompressible, homogeneous in composition and isothermal and the gravitational acceleration ...
Miesen, R.H.M., Kamp, L.P.J., Sluijter, F.W.   +2 more
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On Resonant Interactions of Acoustic Gravity Waves

Radio Science, 1970
The method of averaging in the study of nonlinear oscillations is applied to the problem of resonant wave‐wave interaction of a nonlinear dispersive wave system. The simplicity and directness of the method make it possible to study rather general and complex systems.
K. C. Yeh, C. H. Liu
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Microbarographic Observation of Acoustic Gravity Waves

Nature, 1969
IT is generally believed that some ionospheric disturbances may be partly caused by the acoustic gravity waves travelling upwards from the troposphere1,2. Wave periods of 5 min to more than 1 h and a narrow spectral band at periods of 7–12 min with a nearly sinusoidal character have been observed2,3.
R. C. MURTY, M. J. CURRY
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Acoustic-gravity waves in the thermosphere of Venus

Icarus, 1979
The paper studies the properties of acoustic-gravity waves in the upper atmosphere of Venus by means of a two fluid model which includes the effects of wave-induced diffusion in a diffusively separated atmosphere. It is maintained that in conjunction with neutral mass spectrometer data from the Pioneer Venus orbiter, the theory should provide ...
Anthony D. Del Genio, Gerald Schubert, Joe M. Straus   +2 more
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Quasi-simple wave solutions for acoustic gravity waves

The Physics of Fluids, 1977
The special class of quasi-simple wave solutions is studied for the system of partial differential equations governing inviscid acoustic gravity waves. It is shown that these traveling wave solutions do not admit shocks. Periodic solutions are found to exist when there is no propagation in the vertical direction. The solutions for some particular cases
Seshadri, VS, Sachdev, PL
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Singular Perturbation Analysis of Acoustic-Gravity Waves

The Physics of Fluids, 1969
A singular perturbation analysis of acoustic-gravity waves is presented in which not only the dependent but also the independent variables are expanded in power series of a small parameter ε. The series expansion of the independent variables enables us to correct, at each stage of the expansion, the forward characteristic lines of the governing ...
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Acoustic-gravity waves in model thermospheres

Journal of Geophysical Research, 1967
The acoustic-gravity wave equation is solved analytically for an atmosphere whose sound speed squared profile is of the form: c²(z) = A + Be5z. Application of the solution is made to the study of ducted waves in the thermosphere. The results in the long-period range, where the model should be realistic, compare favorably to observational data.
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On the propagation of magneto-acoustic-gravity waves

Chinese Astronomy and Astrophysics, 1986
Abstract An analysis of magneto-acoustic-gravity waves in the case of an isothermal atmosphere permeated by a uniform magnetic field is presented. The general solution is expressed in terms of generalized hypergeometric functions. It can be used in numerical simulation of oscillations in a magnetic atmosphere.
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Shock formation in acoustic gravity waves

Journal of Geophysical Research, 1970
A new approximate solution for the propagation of acoustic gravity waves is presented. Not only the dependent variables, but also the independent ones are expanded in the form of asymptotic series, the terms of which can be found by an iterative procedure.
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