The phase characteristics of radio waves during oblique propagation in a weakly anisotropic parabolic ionospheric layer are considered in the short-wave radio range. The case of polarization degeneracy of waves is analyzed. The correction to the wave eikonal due to the smallness of the anisotropy is calculated by the perturbation method. The two-valuedness of the solutions corresponds to two normal waves. The figures show the form of these solutions under different conditions of layer probing.
The characteristics of radio waves with inclined propagation in an inhomogeneous magnetoactive ionosphere are considered, taking into account the altitude dependence of the effective frequency of electronic collisions. The results of the calculation of dispersion curves, refractive indices and absorption, ray trajectories, as well as the phase path and total absorption are presented in the figures and analyzed for each of the normal waves at different angles of beam entry into the ionosphere.
The effect of the effective frequency of collisions of electrons with neutral particles and ions on the characteristics of normal waves of radio band during oblique propagation in an inhomogeneous magnetoactive ionosphere is considered. The results of the calculation of dispersion curves, refractive and absorption indices, ray trajectories, as well as the phase path and total absorption are presented in the figures and analyzed for each of the normal waves at different angles of the entry of the ray into the ionosphere.
The statistical properties of the phase (eikonal) of normal waves reflected from the regularly inhomogeneous magnetoactive ionospheric plasma containing random inhomogeneities of electron density are considered. The trajectories of the rays propagated at the pole (the Earth’s vertical magnetic field) are numerically obtained. The dispersions of the fluctuations and spatial coefficients of autocorrelation of the phase are found and analyzed for each of the normal waves at different angles of entry of the ray into the ionosphere.
The statistical properties of the group path and the group delay time of an extraordinary wave with oblique reflection from a non-uniform magnetoactive ionosphere containing random electron density inhomogeneities are considered. The trajectories of rays propagating at the magnetic equator are obtained numerically. The height dependences of the angles between the direction of the ray and the wave normal are constructed. The spatial autocorrelation coefficients of the group path at the exit from the layer are found at different angles of the ray entrance into the ionosphere.
The statistical properties of the eikonal (phase path) of an extraordinary wave reflected from the plane layered magnetoactive ionospheric plasma containing random inhomogeneities of the electron density are considered. The ray trajectories are determined numerically for propagation at the magnetic equator. The spatial coefficients of the autocorrelation of the eikonal at various angles of the ray entrance into the ionosphere are found.
The problem of diffusion of the two parallel rays within oblique propagation in a linear layer containing isotropic random inhomogeneities of the dielectric permittivity is considered. Based on the stochastic ray equations written in the coordinate system of the parabolic cylinder, the coefficients of the equation of Einstein-Fokker, describing the relative diffusion of the rays, are defined. The distribution law of the relative fluctuations of the directions of rays for the case when the initial distance between the rays is much greater than the radius of correlation of fluctuations of the dielectric permittivity, is obtained. It is shown that the distribution in the coordinate system used is valid in any point of the trajectory of the rays, which coordinates satisfy the conditions of the problem considered.
Statistical properties of the phase and group paths of signals reflected from the plane layered medium with anisotropic random inhomogeneities of dielectric permittivity are considered. Analytical expressions for the dispersions and spatial autocorrelation functions of these signal characteristics are obtained for the two models of regular ionospheric layers: linear and parabolic. The results are numerically analyzed for different conditions of ionospheric sounding.
We consider the statistical properties of the fluctuations of the amplitude level of a wave during propagation in a random-inhomogeneous medium with regular refraction. For two models of the ionospheric layers obtained analytical expressions for the dispersions and correlation functions of the amplitude level in the layers. The results are numerically analyzed for different conditions of radio probing of the ionosphere and presented in graphs.
The fluctuations of horizontal displacements of the radio beam reflected from the ionospheric layer containing random inhomogeneities of permittivity are considered. Analytical expressions for the dispersions and correlation functions of the beam displacements at the output layer were obtained for two models of the unperturbed (average) medium. The results are analyzed numerically for various conditions probing.
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