Frequency Dependence of the Wave Field Power Parameters for Limiting Single-Hop Radio Paths in Low Solar Activity Conditions

This paper considers the possibility of the deep trough formation in the integral amplitude–frequency dependence of the wave field at the classical limiting paths of a single-hop ionospheric radio waves propagation under conditions of low solar activity. Calculations based on the global ionospheric model with both standard (IRI) and alternative dynamic (IRI + GDM F 2) representations of the F 2 layer of the ionosphere are compared with the experimental results of multifrequency oblique ionospheric sounding (OIS). It is shown that it is fundamentally possible to use the model to describe this feature based on the energy parameters of the radiation transfer problem in the ionosphere.