Depolarization of Metric Radio Signals and the Spatial Spectrum of Scattered Radiation by Magnetized Turbulent Plasma Slab

Abstract

Abstract-The mutual correlation function of the phase fluctuations of scattered ordinary and extraordinary waves by the magnetized plasma slab with electron density fluctuations and the variance of the Faraday angle is calculated by the perturbation method. Analytical expression of broadening of the spatial spectrum of scattered radiation is obtained for arbitrary fluctuation spectrum. Numerical calculations are carried out for the anisotropic Gaussian fluctuation spectrum at different anisotropy factor and the angle of inclination of prolate irregularities with respect to the external magnetic field. Isolines of the normalized root mean square deviation of the Faraday angle nonlinearly depends on the angle of inclination of prolate irregularities and increases in proportion to the anisotropy factor; two receiving antennas are located in orthogonal planes. It is shown that the broadening of the spatial spectrum of scattered electromagnetic waves by turbulent magnetized plasma slab in the principle plane (location of an external magnetic field) is less than in the perpendicular one.

Analysis of Propagation and Polarization Characteristics of Electromagnetic Waves Through Nonuniform Magnetized Plasma Slab Using Propagator Matrix Method

“…plasma thickness with different N e0 calculated using (23) and (24 (24)). It is shown in Figure 4 that the variance of plasma frequency with the radial distance becomes faster as N e0 is bigger.…”

“…In fact, some phenomena such as Faraday-rotation or dual-refraction will occur when EM wave propagates in magnetized plasma [22][23][24], which means magnetized plasma can evidently change the EM wave polarization. Polarization characteristics of scattered EM signals provide important information about physical conditions in the area of localization of the sources and about the medium parameters on the path of wave propagation, so the analysis of the variance of polarization characteristics of EM waves that pass through a magnetized plasma slab is very important in many practical applications such as communication through the plasma sheath and plasma stealth [22][23][24][25]. The transformation of EM wave polarization under reflection from thin solid-plasma film on the conditions of plasma resonance was investigated by Bakunov and Zhukov [25].…”

“…The transformation of EM wave polarization under reflection from thin solid-plasma film on the conditions of plasma resonance was investigated by Bakunov and Zhukov [25]. The variance of the Faraday angle was studied in [23] and [24] by the wave equation incorporated with the nonlinear dielectric function and by the perturbation method, respectively. However, the effect of varying the plasma parameters on the propagation characteristics and the transformation of EM wave polarization had not been discussed simultaneously in these researches.…”

Simulation as a tool to improve wave heating in fusion plasmas

“…In these works, the depolarisation effect is not taken into account and has not been studied in detail, even though it has been shown that the magnetic shear in a tokamak plays no role (Mazzucato 1998). This phenomenon is known in other domains of telecommunication (Tenouxa & Lostanlen 2012), space plasma Physics (Jandieri et al 2011) or laser plasma Physics (Javan & Adli 2013), and only recently in fusion in (Mirnov et al 2014). The polarisation changes have been studied in Astrophysics (Ledenev et al 2002).…”

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

“…These lines result from the transition of 3 P 3/2 state to 3 S 1/2 state at 409.99 nm and 5 P 3/2 state to 3 S 3/2 state at 390.01 nm. The intensity of N-I spectral lines was obtained from the spectrum by integrating over line profile and normalizing with the spectral response of the instrument [15]. The E, g and A for selected lines can be taken from the NIST Atomic Spectra Datasheet [16].…”