| Autor: |
JANDIERI, GIORGI, ISHIMARU, AKIRA, TUGUSHI, NIKA, MCHEDLISHVILI, NINO |
| Zdroj: |
Transactions of A. Razmadze Mathematical Institute; Apr2024, Vol. 178 Issue 1, p77-86, 10p |
| Abstrakt: |
Statistical characteristics of the temporal spectrum of scattered ordinary and extraordinary electromagnetic waves in the equatorial region of the conductive terrestrial ionosphere are investigated by using the stochastic transport equation for a frequency fluctuation, applying the geometrical optics approximation. The broadening of the temporal spectrum and the shift of its maximum involve the velocity of a turbulent plasma flow and the anisotropic parameters of electron density irregularities. Second-order statistical moments of electromagnetic waves do not depend on the absorption sign and are valid for both active and absorptive random media. The frequency of the turbulent pulsations and the conductivity of the ionospheric plasma have a substantial influence on the evaluation of the spectrum’s varying propagation distances. A new double-humped effect in the temporal spectrum has been revealed for the ordinary wave at different anisotropy factors and the inclination angle of elongated plasmonic structures. Numerical calculations are carried out with the use of experimental data. Investigations of space-time fluctuations of electromagnetic wave radiation are of essential interest for radio astronomy and atmospheric physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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