Excitation of plasma waves in the ionosphere caused by atmospheric acoustic waves

Kotsarenko, N. Ya.; Pérez-Enríquez, R.; Koshevaya, S.

doi:10.1007/bf00645641

Cited by 12 publications

(13 citation statements)

References 2 publications

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“…On the higher‐frequency side (1–10 Hz), the momentum transfer from AWs to ionosphere becomes insignificant within the time‐period of wave () and amplitudes of fluctuations again decreases. As the frequency approaches the ion gyro frequency (∼600 Hz), the fluctuations may again grow in amplitude due to the excitation of ion cyclotron waves (Kostarenko et al 1997). In this study, however, such higher frequency range is not studied.…”

Section: Resultsmentioning

confidence: 99%

Response of the ionosphere to the seismic trigerred acoustic waves: electron density and electromagnetic fluctuations

Kherani

Lognonné

Kamath

et al. 2009

Geophysical Journal International

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S U M M A R YWe study the excitation of low-frequency (0.001-10 Hz) electromagnetic and density fluctuations in the ionosphere during the passage of seismic triggered acoustic waves (AWs). The study involves the generation of ionospheric currents by AWs and subsequent perturbations of the electromagnetic fields and ion and electron density. In this study, the non-local analysis of the fluctuations is carried out in the framework of hydromagnetic theory. Our objective is to examine the spatial and frequency distributions of these fluctuations and to compare them qualitatively with the available observations. The dynamics of both electrojet and F region of ionosphere are included. Also included are the effects of the dip-angle variations of the Earth's magnetic field. Significant anisotropy and inhomogeneities are noted in the fluctuations. The amplitudes of current and magnetic field fluctuations are found to be maximum in the F region where ion inertia is large enough to support the plasma waves and where electron number density and acoustic wave amplitudes are also large. The density fluctuations also follow similar trends. Both electromagnetic and density fluctuations are large in the latitude region where the acoustic wave vibration parallel to the Earth's magnetic field is large. The fluctuations have the tendency to be maximum in the 0.1-1 Hz frequency range. In this range, AWs driven currents and electromagnetic fluctuations may become of order of μAm −2 , nV m −1 and nT, respectively in the F region.

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Section: Resultsmentioning

confidence: 99%

Response of the ionosphere to the seismic trigerred acoustic waves: electron density and electromagnetic fluctuations

Kherani

Lognonné

Kamath

et al. 2009

Geophysical Journal International

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“…The propagation of nonlinear acoustic waves in the atmosphere is described by the following set of hydrodynamic equations [8][9][10]:…”

Section: Physics and Basic Equationsmentioning

confidence: 99%

Nonlinear Excitation of ULF Atmosphere–Ionosphere Waves and Magnetic Perturbations Caused by ELF Seismic Acoustic Bursts

et al. 2003

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Nonlinear excitation of ultra-low frequency (ULF) atmosphere-ionosphere waves by extremely low frequency (ELF) seismic acoustic bursts is discussed. An analysis of the nonlinear transformation of ELF acoustic waves (f ~ 100 Hz) into ULF (f ≤ 1Hz) waves is presented. The ELF wave is excited as the burst-like envelope of a finite transverse scale by the seismic motion of the Earth’s surface. Then, it propagates upwards and is subject to both nonlinearity and dissipation. Nonlinearity leads to the generation of higher harmonics and, thus, to a saw-tooth-like wave structure, and also to an increase in the ULF part of the wave spectrum. This process takes place at the altitudes of z = 0–100 km. For altitudes z > 100 km, the ELF wave dissipates fully, and only ULF acoustic wave can reach the ionosphere dynamo layer (120–200 km), where this wave excites fluctuating currents. Those currents are the sources of Alfvén and fast magnetosonic plasma waves that penetrate into the higher ionosphere and magnetosphere. The simulations of the nonlinear transformation of the acoustic waves are based on the slowly varying profile equation derived from the hydrodynamic equations of air motion. A high efficiency of the nonlinear transformation of ELF acoustic waves into ULF ones is shown. Like a possible linear transformation, this nonlinear transformation causes ULF magnetic field perturbations in the ionosphere of 10-4–101 nT at altitudes z ~ 200 km, possibly accompanied by temperature variations.

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“…It is possible to give a basic classification of different phenomena that confirm this coupling. At present it is clear that this coupling takes place mainly through three basic channels: electromagnetic [2]- [4], acoustic [5]- [7] and chemical [1] ones. The electromagnetic channel is known in principle: variable electric currents, which appear in the lithosphere during and before earthquakes in accordance with Maxwell's equations excite electromagnetic fields that penetrate almost instantaneously into the ionosphere, creating in it an electromagnetic response.…”

Section: Introductionmentioning

confidence: 99%

Transparency of Cosmic Radio Waves Caused by Seismic and Volcano Activities

Koshevaya¹,

Kotsarenko²,

Escobedo³

et al. 2014

JEMAA

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The generation of different waves in the atmosphere and ionosphere caused by seismic and volcano activities has changed the transparency for cosmic radio waves. It is possible to analyze two cases: the first case caused by the atmospheric acoustic wave, which creates a periodic structure of the electron density in the ionosphere. It is shown that the resonant passing of the radio waves takes place, when the length of the acoustic wave is equal to one or a few lengths of the radio wave. The second case produces the electron density decrease in the F-layer of the ionosphere resulting in an increase in the transparency of the ionosphere for cosmic radio waves. The review of these phenomena is provided in this work and both cases have been confirmed experimentally.

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Excitation of plasma waves in the ionosphere caused by atmospheric acoustic waves

Cited by 12 publications

References 2 publications

Response of the ionosphere to the seismic trigerred acoustic waves: electron density and electromagnetic fluctuations

Response of the ionosphere to the seismic trigerred acoustic waves: electron density and electromagnetic fluctuations

Nonlinear Excitation of ULF Atmosphere–Ionosphere Waves and Magnetic Perturbations Caused by ELF Seismic Acoustic Bursts

Transparency of Cosmic Radio Waves Caused by Seismic and Volcano Activities

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