DIURNAL VARIATIONS OF VLF RADIO WAVES IN INHOMOGENEOUS IMPEDANCE CHANNELS
The analysis of diurnal variations of the amplitude and additional phase of the VLF radiowaves in the waveguide «Earth-ionosphere» in winter-spring and summer times on the long paths of east-west and north-south strikes based on data of instrumental radiophysical monitoring was carried out. The specific features of diurnal variations of the amplitude and additional phase of the «Alpha» radio positioning system in the winter-spring and summer times on the «Novosibirsk-Ulan-Ude» path running over the seismoactive Baikal rift zone were exposed. The daytime and nocturnal levels of the amplitude and additional phase of the radio signal were determined. The data bank of continuous measurements of the VLF pulse stream of the natural electromagnetic field of the Earth in the south of Siberia was created. The diurnal variations of the intensity of the VLF pulse stream are stable for each season of the year. The effect of solar eclipses on the propagation of the VLF radiowaves is manifested in the variations of the signal phase.