Magnetospheric VLF response to the atmospheric infrasonic waves

Bespalov, P. A.; Savina, O. N.; Mizonova, V. G.

doi:10.1016/s0273-1177(02)00936-5

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…Ö³ õâèë³ ãðàþòü òàêîae âàaeëèâó ðîëü â äèíàì³ö³ ³îíîñôåðíî¿ ïëàçìè [21]. Çîêðåìà, äîñÿãíóâøè ³îíîñôåðè, ÀÃÂ âïëèâàþòü íà äîáðîòí³ñòü ìàãí³òîñôåðíîãî ðåçîíàòîðà äëÿ åëåêòðîìàãí³òíèõ õâèëü [6]. Íåçâàaeàþ÷è íà òå, ùî îñíîâí³ õàðàêòåðèñòèêè ÀÃÂ âèâ÷åí³ òà âèêëàäåí³ ó íèçö³ êíèã [7,19,34,42,44,47] ³ îãëÿä³â [18,33,50], à òàêîae äîñÿãíóòî ïåâíîãî ïðîãðåñó ó ïîáóäîâ³ ë³í³éíî¿ [16,17,41,51] òà íåë³í³éíî¿ òåîð³¿ öèõ õâèëü [22,24,36,37,43] óâàãà äî äàíî¿ ïðîáëåìè, ÿê ³ ðàí³øå, çàëèøàºòüñÿ âåëèêîþ.…”

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

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

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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“…These waves also play an important role in the dynamics of ionospheric plasma [13]. In particular, having reached the ionosphere, AGWs affect the quality factor of the magnetospheric resonator for electromagnetic waves [14]. Despite the fact that the main characteristics of AGW have been studied and presented in a number of books [15 -20] and reviews [8,10,21], and some progress has been made in constructing a linear [22 -25] and nonlinear theory of these waves [26 -30] interest in this problem is still high.…”

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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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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“…In this paper, we will examine in more detail the first of these possibilities: the modulation of the reflection coefficient of electromagnetic VLF waves from the ionosphere (cf. Bespalov et al, 2003). The reflection coefficient of whistler waves from the ionosphere is determined by several factors, which can be stimulated by acoustic-gravity waves:…”

Section: Introductionmentioning

confidence: 99%

Possibility of magnetospheric VLF response to atmospheric infrasonic waves

Bespalov

Savina

2012

Earth Planet Sp

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In this paper, we consider a model of the influence of atmospheric infrasonic waves on VLF magnetospheric whistler wave excitation. This excitation occurs as a result of a succession of processes: a modulation of the plasma density by acoustic-gravity waves in the ionosphere, a reflection of the whistlers by ionosphere modulation, and a modification of whistler wave generation in the magnetospheric resonator. A variation of the magnetospheric resonator Q-factor has an influence on the operation of the plasma magnetospheric maser, where the active substances are radiation belt particles, and the working modes are electromagnetic whistler waves. The magnetospheric maser is an oscillating system which can be responsible for the excitation of self-oscillations. These self-oscillations are frequently characterized by alternating stages of accumulation and precipitation of energetic particles into the ionosphere during a pulse of whistler emissions. Numerical and analytical investigations of the response of self-oscillations to harmonic oscillations of the whistler reflection coefficient shows that even a small modulation rate can significantly change magnetospheric VLF emissions. Our results can explain the causes of the modulation of energetic electron fluxes and whistler wave intensity with a time scale from 10 to 150 s in the day-side magnetosphere. Such quasi-periodic VLF emissions are often observed in the sub-auroral and auroral magnetosphere and have a noticeable effect on the formation of space weather phenomena.

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Magnetospheric VLF response to the atmospheric infrasonic waves

Cited by 10 publications

References 2 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

Possibility of magnetospheric VLF response to atmospheric infrasonic waves

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