Statistical Characteristics of the Temporal Spectrum of Scatter…

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Journal of Environmental & Earth Sciences | Volume 05 | Issue 01 | April 2023

Journal of Environmental & Earth Sciences

https://journals.bilpubgroup.com/index.php/jees

1. Introduction

This paper reports a study of the features of radio

wave propagation in the equatorial ionosphere of

the Earth. The relevance of the work is determined

by the wide use of decameter and decimeter radio

*CORRESPONDING AUTHOR:

Nika Tugushi, Tbilisi State University, Tbilisi, 0128, Georgia; Email: tugushinika96@gmail.com

ARTICLE INFO

Received: 2 February 2023 | Revised: 6 March 2023 | Accepted: 13 March 2023 | Published Online: 13 April 2023

DOI: https://doi.org/10.30564/jees.v5i1.5442

CITATION

Jandieri, G., Tugushi, N., 2023. Statistical Characteristics of the Temporal Spectrum of Scattered Radiation in the Equatorial Ionosphere. Journal

of Environmental & Earth Sciences. 5(1): 85-94. DOI: https://doi.org/10.30564/jees.v5i1.5442

COPYRIGHT

Copyright © 2023 by the author(s). Published by Bilingual Publishing Group. This is an open access article under the Creative Commons Attribu-

tion-NonCommercial 4.0 International (CC BY-NC 4.0) License. (https://creativecommons.org/licenses/by-nc/4.0/).

ARTICLE

Statistical Characteristics of the Temporal Spectrum of Scattered

Radiation in the Equatorial Ionosphere

George Jandieri 1

, Nika Tugushi2*

1 1VSB—Technical University of Ostrava, Ostrava, 70800, Czech Republic

2 Tbilisi State University, Tbilisi, 0128, Georgia

ABSTRACT

On the basis of the solution of the space-time characteristic system by the method of geometric optics using

symbolic calculations, analytical and numerical simulation of the propagation of the ordinary and extraordinary radio

waves in the conducting equatorial ionospheric plasma was made considering the anisotropy of plasma irregularities

and non-stationary nature of propagation medium. Broadening of the spectrum and the displacement of its maximum

contain velocity of a turbulent plasma ow and parameters characterizing anisotropic plasmonic structures. Statistical

moments of both radio waves do not depend on the absorption sign and are valid for both active and absorptive random

media. Temporal pulsations and conductivity of a turbulent ionospheric plasma have an inuence on the evaluation of

the spectrum-varying propagation distances travelling by these waves. The new double-humped effect in the temporal

spectrum has been revealed for the ordinary wave varying anisotropy coefcient and dip angle of stretched plasmonic

structures. From a theoretical point of view, the algorithms developed in this work allow effective modelling of the

propagation of both radio signals in the equatorial conductive ionospheric plasma, considering the external magnetic

eld, inhomogeneities of electron density in-homogeneities, as well as non-stationary.

Keywords: Electromagnetic waves; Turbulence; Statistical characteristics; Waves propagation; Atmosphere;