Ground-Based Acoustic Impact on the Atmosphere: The Results of Observations by Means of Incoherent Scatter and Vertical Sounding Techniques

Emelyanov, L. Ya.; Zhivolup, T. G.; Soroka, S. A.; Cheremnykh, O. K.; Черногор, Л. Ф.

doi:10.15407/rpra20.01.037

Cited by 6 publications

(1 citation statement)

References 1 publication

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“…Concerning the ionospheric responses with a time delay of about 10-30 min, these may presumably be connected with the processes in the F region of the ionosphere such as the photochemistry processes and the release of energy accumulated in the atmosphere-ionosphere system or dissipation (Emelyanov et al, 2015;Pulinets et al, 2011;Sorokin and Hayakawa, 2014). Another effect concerning a possible delay in the ionospheric response could be re-reflections from the boundaries of the "magnetosphere-ionosphere" or "ionosphere-atmosphere" during bounce oscillations.…”

Section: Y G Rapoport Et Al: Ground-based Acoustic Parametric Genementioning

confidence: 99%

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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Section: Y G Rapoport Et Al: Ground-based Acoustic Parametric Genementioning

confidence: 99%

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

Rapoport¹,

Cheremnykh²,

Koshovy³

et al. 2017

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

Algorithm for modeling electromagnetic channel of seismo-ionospheric coupling (SIC) and the variations in the electron concentration

Rapoport

Grimalsky²,

Krankowski

et al. 2019

Acta Geophys.

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Nonlinear frequency down-conversion of acoustic wave beams in the atmosphere and ionosphere under different types of modulation (regular item)

Grimalsky¹,

Rapoport

Tecpoyotl-Torres³

et al. 2022

Journal of Atmospheric and Solar-Terrestrial Physics

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Ground-Based Acoustic Impact on the Atmosphere: The Results of Observations by Means of Incoherent Scatter and Vertical Sounding Techniques

Cited by 6 publications

References 1 publication

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

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

Algorithm for modeling electromagnetic channel of seismo-ionospheric coupling (SIC) and the variations in the electron concentration

Nonlinear frequency down-conversion of acoustic wave beams in the atmosphere and ionosphere under different types of modulation (regular item)

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