Acoustic-gravity waves in the earth’s atmosphere (review)

We describe the results of using the incoherent scatter technique to observe time-altitude variations in regular parameters of the ionospheric plasma and wave disturbances, which accompanied periodic modification of the near-Earth plasma by radio waves emitted by the "Sura" facility. A distinctive feature of the experiments was that the processes in the ionosphere were diagnosed at a distance of about 1000 km from the facility. It was found that the spectrum composition of wave disturbances in the electron density was changing noticeably during the active experiment. Quasi-periodic processes in the ionosphere were observed with a delay of about 40-60 min. The relative amplitude of wave disturbances was equal to 0.02-0.10, and the periods were equal to 30, 60, 120, and 150-180 min. The observed effect can be explained by the generation and/or amplification of traveling ionospheric disturbances. The results of theoretical estimations agree well with the observational data.

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“…The law of energy conservation in a unit volume (see, e.g., [31]) will be chosen as the basic equation:…”

Section: Results Of the Spectrum Analysismentioning

confidence: 99%

Variations in the parameters of scattered signals and the ionosphere connected with plasma modification by high-power radio waves

Burmaka

Domnin

Uryadov

et al. 2009

Radiophys Quantum El

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“…(5) it follows that the gravitational waves are also always more low-frequency than acoustic waves. In the ionospheric F-region, acoustic waves have a period of 5-13 min and gravitational 1-1.5 h. The maximum velocity of the AGW propagation in the ionosphere does not exceed 700-800 m s −1 (Khantadze, 1973;Grigor'ev, 1999). As it follows from Eq.…”

Section: Equations Of Electromagnetic Ionospheric Oscillationsmentioning

confidence: 98%

Electromagnetic oscillations of the Earth's upper atmosphere (review)

et al. 2010

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Abstract.A complete theory of low-frequency MHD oscillations of the Earth's weakly ionized ionosphere is formulated. Peculiarities of excitation and propagation of electromagnetic acoustic-gravity, MHD and planetary waves are considered in the Earth's ionosphere. The general dispersion equation is derived for the magneto-acoustic, magnetogravity and electromagnetic planetary waves in the ionospheric E-and F-regions. The action of the geomagnetic field on the propagation of acoustic-gravity waves is elucidated. The nature of the existence of the comparatively new largescale electromagnetic planetary branches is emphasized.

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“…It was shown above that for Δt 0 ≈ 10 min this corresponds to the apparent propagation velocity of ionospheric disturbances about 320-400 m/s. The mentioned periods and amplitudes of relative disturbances of N , as well as the lag times of signal arrival, well correspond to characteristics of the traveling ionospheric disturbances caused by the generation (amplification) of internal gravity wavs in the neutral atmosphere [6][7][8].…”

Section: Characteristics Of Quasiperiodic Variations In Doppler Frequmentioning

confidence: 99%

“…Acoustic-gravity waves [6][7][8] hold a prominent place among low-frequency waves with the periods T = 1-180 min. The feasibility of their generation by high-power radio emission of groundbased transmitters was studied both theoretically [9][10][11] and experimentally [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Variations in the ionospheric wave perturbation spectrum during periodic heating of the plasma by high-power high-frequency radio waves

Черногор

Frolov

Комраков

et al. 2011

Radiophys Quantum El

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We present the results of spectral analysis of temporal variations in the Doppler frequency shift of the ionosphere-reflected signals from a high-frequency vertical ionospheric sounding radar located near the city of Kharkov in the days of exposure of the ionospheric plasma to the high-power radio emission of the Sura facility (Nizhny Novgorod) and in the reference day in the absence of such an exposure. It was established that the spectral characteristics of quasiperiodic variations in the Doppler frequency shift in the range of periods 10-60 min in the days of work of the facility and in the reference day differed significantly. This is considered as evidence in favor of the generation (amplification) of acoustic-gravity waves propagating at the ionospheric altitudes by high-power periodic high-frequency radiation of the Sura facility.

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Acoustic-gravity waves in the earth’s atmosphere (review)

Cited by 59 publications

References 93 publications

Variations in the parameters of scattered signals and the ionosphere connected with plasma modification by high-power radio waves

Variations in the parameters of scattered signals and the ionosphere connected with plasma modification by high-power radio waves

Electromagnetic oscillations of the Earth's upper atmosphere (review)

Variations in the ionospheric wave perturbation spectrum during periodic heating of the plasma by high-power high-frequency radio waves

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