High-latitude ionospheric phenomena diagnostics by high-frequency radio wave propagation observations

A system of radio paths in the decameter wave band is used to experimentally solve the problem of diagnostics of high-latitude ionospheric phenomena. Either the statistical parameters of radio signals at radio channel output or the radio wave propagation parameter on the basis of data of oblique sounding of the ionosphere is used as a source of information on a phenomenon. The former approach is taken in the diagnostics of auroral substorms and the main ionization trough. Oblique sounding is used in daytime polar cusp diagnostics. The experimental observations were carried out by two systems of paths: one is situated north of eastern Siberia, and the other encompasses the area north of the European part of the former USSR. The range of corrected geomagnetic latitudes is 55-75 deg. It is concluded that this system of radio paths makes it possible to conduct qualitative short-time prediction of these ionospheric phenomena. 11 refs