Start Date: 2019-01-01 End Date: 2021-01-01
On the basis of developed in the project unified approach linear and nonlinear theory of propagation of ultra-low frequency (ULF) planetary electromagnetic (EM) Rossby type waves is developed with account of their interaction with spatially inhomogeneous mean shear zonal flow in all weakly ionized ionospheric D, E and F-layers. New physical mechanisms of generation of such waves for ionospheric layers are investigated. The possibility of linear coupling of fast and slow ULF planetary EM waves in the ionosphere with shear zonal flow is clarified. The problem of self-organization of ULF waves into nonlinear solitary vortical structures in different ionospheric layers is studied and the appropriate spatially localized analytic stationary solutions are constructed with account of interaction with mean shear zonal flow. The appropriate model system of 2D and 3D magnetohydrodynamic nonlinear equations is obtained and analyzed which describes the dynamic of such large-scale solitary vortical structures. The mechanisms of parametric generation of zonal flows by mean shear zonal flow is studied. Identification of main characteristics of ULF perturbations is performed and the results are compared with the existing satellite and ground-based experimental data for the different ionospheric layers. Under the elaboration of project the necessity of analogous investigations for the acoustic-gravity waves was specified with a view to extension the international collaboration.