Increase of the Transparency for Cosmic Radio Waves due to the Decrease of Density of the Ionosphere Caused by Acoustic Waves

Koshevaya, S.; Grimalsky, V.; Pérez-Enríquez, R.; Kotsarenko, A.

doi:10.1238/physica.regular.072a00091

Cited by 6 publications

(12 citation statements)

References 9 publications

(11 reference statements)

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“…Nekrasov et al 1995;Aburdzhaniya 1996;Kotsarenko et al 1999;Sorokin and Chmyrev 1999;Koshevaya et al 2005;Kaladze et al 2008aKaladze et al , 2008b. Kaladze et al (2008a) thus generalized (5a) to…”

Section: Related Plasma Physics Phenomenamentioning

confidence: 99%

Nonlinear acoustic–gravity waves

2009

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Section: Related Plasma Physics Phenomenamentioning

confidence: 99%

Nonlinear acoustic–gravity waves

2009

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“…The acoustic channel of seismo-ionospheric coupling can be investigated by means of active experiments on the penetration of modulated intense sound waves from man-made sources from the Earth's surface into the ionosphere. It is connected, in particular, with the role of the frequency transformation of sound excited by the parametric sound generator (PSG), including its experimental and theoretical investigation (Parrot et al, 2007;Koshovyy, 1999;Kotsarenko et al, 1999;Koshevaya et al, 2005).…”

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confidence: 99%

“…In Koshevaya et al (2005), the use of an acoustic generator is as the source of the acoustic signal that is similar to natural hazards caused by underground eruptions. This approach may help to investigate the acoustic signal effects in the ionosphere that should be released by the PSG (Soroka et al, 2006;Aramyan et al, 2008).…”

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confidence: 99%

“…This approach may help to investigate the acoustic signal effects in the ionosphere that should be released by the PSG (Soroka et al, 2006;Aramyan et al, 2008). In previous papers (Kotsarenko et al, 1999;Grimalsky et al, 2003;Koshevaya et al, 2005), the theory of the sound wave penetration produced by the two-frequency PSG has been proposed. Kotsarenko et al (1999) described the change in the ionosphere transparency for radio waves from galactic radio sources that is connected with the spatial resonance between the periodical variations in the plasma density caused by AGWs and the radio waves.…”

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confidence: 99%

“…Kotsarenko et al (1999) described the change in the ionosphere transparency for radio waves from galactic radio sources that is connected with the spatial resonance between the periodical variations in the plasma density caused by AGWs and the radio waves. The influence of nonlinearity, gravity, dissipation (in the form of viscosity), non-isothermality, and diffraction on the infrasonic waves generated by the PSG has been considered (Koshevaya et al, 2005). Important theoretical results (Koshevaya et al, 2005) have demonstrated the nonlinear frequency conversion in the course of the penetration of intermediate frequency sound waves (ISWs) into the atmosphere with further transformation to AGWs and a change in transparency for radio waves, propagating through the nonuniform plasma due to nonlinear variation in the plasma density on average within the ionospheric F layer.…”

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Ground-based acoustic parametric generator impact on the atmosphere and ionosphere in an active experiment

Rapoport¹,

Cheremnykh²,

Koshovy³

et al. 2017

Ann. Geophys.

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Abstract. We develop theoretical basics of active experiments with two beams of acoustic waves, radiated by a ground-based sound generator. These beams are transformed into atmospheric acoustic gravity waves (AGWs), which have parameters that enable them to penetrate to the altitudes of the ionospheric E and F regions where they influence the electron concentration of the ionosphere. Acoustic waves are generated by the ground-based parametric sound generator (PSG) at the two close frequencies. The main idea of the experiment is to design the output parameters of the PSG to build a cascade scheme of nonlinear wave frequency downshift transformations to provide the necessary conditions for their vertical propagation and to enable penetration to ionospheric altitudes. The PSG generates sound waves (SWs) with frequencies f 1 = 600 and f 2 = 625 Hz and large amplitudes (100-420 m s −1 ). Each of these waves is modulated with the frequency of 0.016 Hz. The novelty of the proposed analytical-numerical model is due to simultaneous accounting for nonlinearity, diffraction, losses, and dispersion and inclusion of the two-stage transformation (1) of the initial acoustic waves to the acoustic wave with the difference frequency f = f 2 − f 1 in the altitude ranges 0-0.1 km, in the strongly nonlinear regime, and (2) of the acoustic wave with the difference frequency to atmospheric acoustic gravity waves with the modulational frequency in the altitude ranges 0.1-20 km, which then reach the altitudes of the ionospheric E and F regions, in a practically linear regime. AGWs, nonlinearly transformed from the sound waves, launched by the two-frequency ground-based sound generator can increase the transparency of the ionosphere for the electromagnetic waves in HF (MHz) and VLF (kHz) ranges. The developed theoretical model can be used for interpreting an active experiment that includes the PSG impact on the atmosphere-ionosphere system, measurements of electromagnetic and acoustic fields, study of the variations in ionospheric transparency for the radio emissions from galactic radio sources, optical measurements, and the impact on atmospheric aerosols. The proposed approach can be useful for better understanding the mechanism of the acoustic channel of seismo-ionospheric coupling.

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