Experimental study of the structure of the SW-signal in the vicinity of the dead zone

Details Experimental study of the structure of the SW-signal in the vicinity of the dead zone Experimental study of the structure of the SW-signal in the vicinity of the dead zone

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ge%26ae..22..505t&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 22, May-June 1982, p. 505-508. In Russian.

Computer Science

1

Decametric Waves, Ionospheric Propagation, Short Wave Radio Transmission, Wave Propagation, Focusing, Signal Reception, Time Response

Scientific paper

Characteristics of the focussing of short radio waves at the edge of the dead zone upon the oblique transmission of decametric waves along single-hop paths at sunrise and sunset are investigated. Measurements of the temporal, frequency and spatial structure of the signal at the edge of the dead zone were made along the Tashkent-Tomsk path using a carrier frequency of 20.4 MHz. Examination of the interference fringes produced by the fading signal indicates the path difference between the upper and lower rays of the ordinary wave components to be between 234 and 1540 m, changing at a rate between 1 and 6.9 m/sec. The difference in the focussing times of the magnetoionic components is found to be between 1 and 12.6 min. Initial and final values of the difference in the Doppler shifts of the upper and lower ordinary rays range from 0.16 to 1 and 0.04 to 0.3 Hz, respectively. The dead zone moves in a direction close to that from the transmitter to the receiver at sunset, and in the opposite direction at sunrise.

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