The model of radio wave propagation in 1-10 MHz frequency range on the base of normal wave method

Within the framework of waveguide approach, we propose a method of describing radio wave propagation in the Earth-ionosphere waveguide for the low-frequency part of decameter range. We consider the case when the carrier frequency can be less than the minimal critical frequency of the ionosphere layer for the propagation path. On the basis of the normal wave method, the scheme of solution for radial case and of computation of the radial operator spectrum was modified. We developed a numerical algorithm for computing the electromagnetic radiation field for frequencies for which the regular Earth-ionosphere waveguide occurs and the number of normal waves is sufficiently large.