Yu.B. Bashkuev – Dr.Sc.(Eng.), Professor, Head of Laboratory, Institute of Physical Materials Science SB RAS (Ulan-Ude) E-mail: buddich@mail.ru

L.Kh. Angarkhaeva – Ph.D.(Phys.-Math.), Associate Professor, Leading Research Scientist, Institute of Physical Materials Science SB RAS (Ulan-Ude)

E-mail: ludang@rambler.ru

M.G. Dembelov – Ph.D.(Phys.-Math.), Senior Research Scientist, Institute of Physical Materials Science SB RAS (Ulan-Ude) E-mail: mdembelov@mail.ru

Areas of applicability of impedance boundary conditions are defined to improve the accuracy of electromagnetic field calculations at small values of relative complex permittivity of two-layer «forest-soil» and «ice-sea» structures. They are necessary to calculate the attenuation function W of radio wave field. It found that the use of the effective impedance corresponding to the impedance of a plane vertically polarized wave allows to predict W in the LW-MW bands, including high frequencies, when the displacement currents prevail or comparable with conduction currents. Calculations of W in the MW range for radiopaths «forest-soil», «ice-sea» showed the appearance of a surface electromagnetic wave (SEW) when |W | is greater than one at the location of the transmitter and the observation point at the interface. Field calculations should be carried out using the surface impedance calculated by formulas (1) and (2).

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