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In order to analyze the radio waves propagation conditions in non-uniform impedance channels, the amplitude and additional phase of the electromagnetic field of the VLF radio navigation system RSDN-20 were measured. The radio paths of latitudinal strike have been studied: path 1 “Novosibirsk - Ulan-Ude”, the length is 1580 km; path 2 “Komsomolsk-on-Amur - Ulan-Ude”, the length is 2080 km. The daily variations of the amplitude and the additional phase of the 11.9 and 14.88 kHz radio signals are considered.

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Analysis of the Conditions for the Radio Waves Propagation in the Waveguide “Earth-Ionosphere” on the Paths “Novosibirsk-Ulan-Ude” and “Komsomolsk-on-Amur-Ulan-Ude” During Magnetic Storms August 31-September 12, 2017