Study of the conditions for the propagation of round-the-world signals at the solar activity maximum

Details Study of the conditions for the propagation of round-the-world signals at the solar activity maximum Study of the conditions for the propagation of round-the-world signals at the solar activity maximum

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ge%26ae..22..503p&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 22, May-June 1982, p. 503-505. In Russian.

Physics

Diurnal Variations, Ionospheric Propagation, Maxima, Short Wave Radiation, Solar Activity Effects, Annual Variations, F 2 Region, Propagation Modes, Wave Propagation

Scientific paper

Diurnal variations in the angular characteristics of round-the-world short-wave transmissions are studied during the solar activity maximum of 1978-1980, when propagation in the ionospheric wave channel was enhanced, allowing the use of a medium-power transmitter. Amplitude, elevation angle and azimuth angle were recorded for round-the-world direct, round-the-world reverse and direct signals of 10 and 15-MHz frequency from a transmitter located about 1200 km in latitude from the receiver. The directional properties of the antenna system allowed the differentiation between round-the-world direct and reverse signals, the former of which are found to predominate in the summer and the latter in the winter. Results also suggest the presence of around-the-world direct signal in the winter in the azimuth range 0 to 120 deg. The importance of the gradient in the critical frequency of the F2 region for the long-range transmission of short radio waves is also demonstrated.

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