Evanescent acoustic-gravity modes in the isothermal atmosphere: systematization and applications to the Earth and solar atmospheres

Cheremnykh, O. K.; Fedorenko, A.K.; Kryuchkov, E. I.; Selivanov, Yu.A.

doi:10.5194/angeo-37-405-2019

Cited by 37 publications

(7 citation statements)

References 29 publications

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“…which are usually used to consider both acoustic and gravity waves [1,48], as well as evanescent waves [32,38,39]. Note the horizontal anisotropy of wave propagation, namely, the dependence of the form of equations ( 5) -( 7) on the direction of wave propagation.…”

Section: Initial Equationsmentioning

confidence: 99%

“…The role of evanescent waves in the dynamics and energy of atmospheric processes has been studied to a much lesser extent. Until recently, only a few solutions were known for evanescent modes: the Brunt-Väisälä oscillation ( [32]), the Lamb wave [35,36], the f-mode [37], and the γ-mode [38]. However, in [39] it was shown that the spectrum of evanescent acoustic-gravity waves is continuous.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Earth's atmosphere rotation on the spectrum of acoustic-gravity waves

Cheremnykh,

Vlasov

2022

Preprint

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It was shown in a recent paper by Cheremnykh et al. (Advances in Space Research, 2022) that taking into account the rotation of the Earth's atmosphere leads to the appearance of a new region of evanescent waves with a continuous frequency spectrum on the diagnostic diagram of acoustic-gravity waves. The region is located below the lower limit of gravity waves, which is equal 2Ω at all wavelengths, where Ω is the angular frequency of the atmosphere rotation. This result was obtained for high-latitude regions of the atmosphere, in which we can limit ourselves to considering only the vertical component of the Earth's rotation frequency. In the proposed paper we show that taking into account both components of the vector of the atmosphere rotation frequency − → Ω -horizontal, Ω cos ϕ , and vertical, Ω sin ϕ, where ϕ is the Earth's latitude, the dominant role in the acoustic-gravity waves propagation is played by the vertical component. It is shown that the horizontal component leads to an insignificant modification on the diagnostic diagram of the boundaries of the areas of acoustic and gravity waves, which can be neglected. Also shown that the strongest vertical component of the frequency affects the lower limit of gravity waves, which depends at all wavelengths on the latitude of the observation site and is equal to 2Ω sin ϕ.

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Section: Initial Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Earth's atmosphere rotation on the spectrum of acoustic-gravity waves

Cheremnykh,

Vlasov

2022

Preprint

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“…Ðîëü åâàíåñöåíòíèõ õâèëü â äèíàì³ö³ òà åíåðãåòèö³ àòìîñôåðíèõ ïðîöåñ³â âèâ÷åíà çíà÷íî ìåíøîþ ì³ðîþ. Äî íåäàâíüîãî ÷àñó áóëî â³äî ìî ëèøå ê³ëüêà ðîçâ'ÿçê³â äëÿ åâàíåñöåíòíèõ ìîä: êîëèâàííÿ Áðåí òà -Âÿéñÿëÿ [49]), õâèëÿ Ëåìáà [4,28], f-ìîäà [23], à òàêîae g-ìîäà [9]. Îäíàê â ðîáîò³ [10] áóëî ïîêàçàíî, ùî ñïåêòð åâàíåñöåíòíèõ àêóñòèêî-ãðàâ³òàö³éíèõ õâèëü º íåïåðåðâíèì.…”

Section: âïëèâ îáåðòàííÿ àòìîñôåðè çåìë³ íà ñïåêòð àêóñòèêî-ãðàâ³òàö³...unclassified

“…ÿê³ çàçâè÷àé âèêîðèñòîâóþòüñÿ ÿê äëÿ ðîçãëÿäó àêóñòè÷íèõ ³ ãðàâ³òà -ö³éíèõ õâèëü [20,45], òàê ³ åâàíåñöåíòíèõ õâèëü [9,10,49]. Â³äçíà÷èìî ãîðèçîíòàëüíó àí³çîòðîï³þ ïîøèðåííÿ õâèëü, à ñàìå çàëåaeí³ñòü âèäó ð³âíÿíü ( 5)-( 7) â³ä íàïðÿìêó ïîøèðåííÿ õâèëü.…”

Section: âèõ²äí² ð²âíßííßunclassified

Influence of the Earth’s atmosphere rotation on the spectrum of acoustic-gravity waves

Cheremnykh¹,

Cheremnykh²,

Vlasov³

2022

Kinemat. fiz. nebesnyh tel (Online)

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“…Якщо не враховувати затухання, то дисперсійне рівняння (6) має бути дійсним, і це накладає певні обмеження на параметр a . Він може бути або дійсним, що відповідає горизонтальним (еванесцентним) хвилям [18,19], або мати вид (1/ 2 ) [10]. Це відповідає вільно поширюваним АГХ, які розповсюджуються під кутом до горизонтальної площини, і найчастіше спостерігаються в земній атмосфері [8,9].…”

Section: T Divv Ttunclassified

Recovery of Spectral Properties of Acoustic-Gravity Waves in Satellite Measurements

Klymenko¹,

Cheremnykh²,

Fedorenko³

et al. 2022

PC&I

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Acoustic-gravity waves (AGWs) are the important mechanism for transferring energy in the atmosphere from the Earth and space disturbances. Theresult of the expansion of AGWs is the fluctuations of atmospheric parameters, which can be registered by ground-based and satellite measurements.However, each of the methods has certain limitations on obtaining information about the properties of the waves. In this regard, it is important thedevelopment of methods which allow us to recover the spectral properties ofAGWs on the basis of limited experimental data. In this article, an analyticalmethod for determining the spectral properties of acoustic-gravity wavesfrom direct satellite measurements is proposed. The method is based on polarization relations, which connect the wave fluctuations of different atmospheric parameters (temperature, density and velocity of particles). It is basedon the determination of the phase shifts between oscillations of some physical parameters of the atmosphere, which are available in satellite measurements. Simple analytical relations are obtained, which allow us to determinethe spectral characteristics of AGW, the nature of wave propagation (horizontal or freely propagated at an angle to the horizontal plane) and their direction relative to the satellite. It is shown that the feature of evanescentwaves is in-phase or anti-phase oscillations of density and temperature. Infreely propagating AGH, these oscillations have a certain phase shift, themagnitude of which depends on the spectral properties. The results obtainedin this work allow us to determine immediately the type of the waves towhich the observed atmospheric perturbation belongs. According to the experimental data, the proposed method for determining the AGW spectralcharacteristics of AGWs has been tested. For this purpose, the measurements of atmospheric AGW parameters in the polar regions on the Dynamics Explorer 2 satellite were used.

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Evanescent acoustic-gravity modes in the isothermal atmosphere: systematization and applications to the Earth and solar atmospheres

Cited by 37 publications

References 29 publications

Influence of the Earth's atmosphere rotation on the spectrum of acoustic-gravity waves

Influence of the Earth's atmosphere rotation on the spectrum of acoustic-gravity waves

Influence of the Earth’s atmosphere rotation on the spectrum of acoustic-gravity waves

Recovery of Spectral Properties of Acoustic-Gravity Waves in Satellite Measurements

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