Abstract—An analytical solution is obtained for the problem of excitation of electromagnetic waves by a horizontal dipole located at the interface between vacuum and a conducting two-layer medium, based on the smallness of the wavelength in a conducting medium compared to vacuum. Numerical calculations have been carried out, which made it possible to evaluate the effectiveness of this approach and show that the approximate formulas describe the behavior of the field with high accuracy. An asymptotic representation is obtained for the magnetic field at the interface between a flat-layered Earth and the atmosphere, which has the form of a wave in a homogeneous half-space with an excitation coefficient depending on the effective conductivity of the lower half-space, which is useful for determining the electrical conductivity of the lithosphere based on experimental data recording the electromagnetic field of an active source. A high sensitivity of the vertical component of the magnetic field to the conductivity of the medium in comparison with the horizontal is noted.
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The study was financially supported by the Russian Foundation for Basic Research (project no. 19-05-00823).
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Tereshchenko, E.D., Tereshchenko, P.E. Influence of Layering of the Lithosphere on Excitation of Extremely Low-Frequency Electromagnetic Waves by a Horizontal Dipole. J. Commun. Technol. Electron. 66, 397–402 (2021). https://doi.org/10.1134/S1064226921040148
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DOI: https://doi.org/10.1134/S1064226921040148