STATISTICAL MOMENTS AND SCINTILLATION LEVEL OF SCATTERED ELECTROMAGNETIC WAVES IN THE MAGNETIZED PLASMA

George Jandieri,Vladimir George Gavrilenko,Akira Ishimaru,Banmali Rawat,Oleg Kharshiladze

doi:10.2528/pierc18030602

Abstract

Statistical characteristics of scattered ordinary and extraordinary electromagnetic waves in the magnetized plasma are considered using the smooth perturbation method. Diffraction effects and polarization coefficients are taken into account. Second order statistical moments of scattered radiation are obtained for arbitrary correlation function of electron density fluctuations. Broadening of the spatial power spectrum and displacement of its maximum, wave phase structure function and the angle-of-arrivals are obtained for three-dimensional spectral function containing anisotropic Gaussian and power-law spectral functions. Scintillation level of scattered radiation is analyzed for different parameters characterizing anisotropic plasma irregularities for the ionospheric F-region. The spectral widths (first and second moments) of the power spectrum and scintillation periods are calculated for “frozen-in” drifting elongated plasma irregularities using the experimental data.

Highlights

At the present time peculiarities of electromagnetic waves propagation in randomly inhomogeneous media have been rather well studied [1,2]
Statistical characteristics and scintillation level of scattered ordinary and extraordinary waves in the collision magnetized plasma normal to the external magnetic field have been considered in [7,8,9,10] using modify smooth perturbation method
These conditions are not in contravention to the assumption of strong phase fluctuations because in a smoothly inhomogeneous medium mean spatial scale of plasma irregularities of the phase correlation function substantially exceeds the wavelength of scattered electromagnetic waves, l >> l ( l is characteristic spatial scale of plasma irregularities caused by electron density fluctuations) [2] and the angle of the normal to the random wavefront Dq ~ l < j12 > / l can remain small even at

Summary

Introduction

At the present time peculiarities of electromagnetic waves propagation in randomly inhomogeneous media have been rather well studied [1,2]. The fluctuations in amplitude and phase (scintillation) of radio waves propagating through the ionosphere are caused by plasma irregularities in the electron density. Ionospheric scintillation models contain the worldwide climatology of the ionospheric plasma density irregularities that cause scintillation, coupled to a model for the effects of these irregularities on radio signals These irregularities distort the original wave front, giving rise to a randomly phasemodulated wave. Statistical characteristics and scintillation level of scattered ordinary and extraordinary waves in the collision magnetized plasma normal to the external magnetic field have been considered in [7,8,9,10] using modify smooth perturbation method. Normalized scintillation level is calculated for different anisotropy factor and orientation angle of elongated plasma irregularities with respect to the external magnetic field.

Formulation of the problem

G m 2k02 ùû

Numerical calculations

Conclusions