Results 21 to 30 of about 56,536 (266)

Excitation of acoustic-gravity waves in an isothermal atmosphere [PDF]

Tellus, 1971
The excitation of acoustic-gravity waves in an isothermal atmosphere is considered in this paper. It is shown that the excitation due to mass production, momentum production and heat production can be discussed by examining the same differential equation. The sources are assumed to be extended and vary both in time and in space.
C. H. Liu, K. C. Yeh
openaire   +1 more source

Identification of acoustic-gravity waves from satellite measurements [PDF]

Kinematika i fizika nebesnyh tel (Online), 2021
A method for recognizing the types of linear acoustic gravity waves (AGWs) in the atmosphere from satellite measurements is proposed. It is shown that the polarization relations between fluctuations of wave parameters (velocity, density, temperature, and pressure) for freely propagating waves, as well as evanescent wave modes, differ significantly ...
Y.O. Klymenko, A.K. Fedorenko, E.I. Kryuchkov, O.K. Cheremnykh, A.D. Voytsechovska, Y.O. Selivanov, I.T. Zhuk   +6 more
openaire   +2 more sources

On the origin of medium-period ionospheric waves and their possible modelling: a short review

Annals of Geophysics, 1997
This article introduces the concept of ionospheric waves with periods from about 15 min to about 4 h as one of the acoustic-gravity wave-induced phenomena.
B. Zolesi, L. R. Cander, P. Dominici
doaj   +1 more source

Observation and simulation of atmospheric gravity waves exciting subsequent tsunami along the coastline of Japan after Tonga explosion event

Scientific Reports, 2022
Tsunamis are commonly generated by earthquakes beneath the ocean floor, volcanic eruptions, and landslides. The tsunami following the Tonga eruption of 2022 is believed to have been excited by atmospheric pressure fluctuations generated by the explosion ...
Yasuhiro Nishikawa, Masa-yuki Yamamoto, Kensuke Nakajima, Islam Hamama, Hiroaki Saito, Yoshihiro Kakinami, Masumi Yamada, Tung-Cheng Ho   +7 more
doaj   +1 more source

Effects of high-latitude atmospheric gravity wave disturbances on artificial HF radar backscatter [PDF]

, 2006
International audienceObservations of HF radar backscatter from artificial field-aligned irregularities in an ionosphere perturbed by travelling disturbances due to atmospheric gravity waves are presented.
Tim K. Yeoman (7583066), A. Senior, M. J. Kosch (7595327), I. W. McCrea, M. T. Rietveld (7594184), Rietveld, M. T., Senior, A., T. K. Yeoman, I. W. McCrea (7594871), M. T. Rietveld, Kosch, M. J., M. J. Kosch, A. Senior (3255282), McCrea, I. W., Yeoman, T. K.   +14 more
core   +1 more source

Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes [PDF]

, 2013
We present observational evidence for the presence of MHD (magnetohydrodynamic) waves in the solar photosphere deduced from SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) Dopplergram velocity observations.
Shelyag, S., Thompson, Michael John, Zharkov, Sergei, Zharkov, S., M. J. Thompson, Fedun, V., S. Zharkov, Shelyag, Sergiy, Erdélyi, Robert, R. Erdélyi, Erdelyi, R., S. Shelyag, V. Fedun, Fedun, Viktor, Thompson, M.J.   +14 more
core   +1 more source

Acoustic-gravity modons in the atmosphere [PDF]

Annales Geophysicae, 1995
It is shown that the equations governing low-frequency acoustic-gravity waves in a stable stratified atmosphere can have localized dipole-vortex solutions (modons).
L. Stenflo, Y. A. Stepanyants
doaj   +1 more source

SATELLITE STUDIES OF IONOSPHERIC MANIFESTATIONS OF ACOUSTIC-GRAVITY WAVES

Radio Physics and Radio Astronomy, 2014
The response of the ionospheric plasma on the propagation of acoustic-gravity waves (AGW) studied at altitudes of 250 − 350 km using the satellite Dynamics Explorer 2 measurements. Wave perturbations are analyzed according to simultaneously measured data
A. V. Bespalova, A. K. Fedorenko
doaj   +1 more source

Heating and cooling of the thermosphere by internal gravity waves [PDF]

, 2009
For the first time, estimates of heating and cooling in the upper thermosphere due to dissipating and breaking gravity waves ( GWs) of tropospheric origin have been obtained with a comprehensive general circulation model ( GCM).
Yiğit, E., Medvedev, Alexander S., Medvedev, AS, Yigit, E, Yiğit, Erdal, Medvedev, A.   +5 more
core   +1 more source

Propagation of acoustic-gravity waves in the atmosphere [PDF]

Journal of Geophysical Research, 1962
Homogeneous wave guide theory is used to derive dispersion curves, vertical pressure distributions, and synthetic barograms for atmospheric waves. A complicated mode structure is found involving both gravity and acoustic waves. Various models of the atmosphere are studied to explore seasonal and geographic effects on pulse propagation. The influence of
Press, Frank, Harkrider, David
openaire   +3 more sources