Measurements of ionospheric refraction at 80 MHz using discrete radio sources

Details Measurements of ionospheric refraction at 80 MHz using discrete radio sources Measurements of ionospheric refraction at 80 MHz using discrete radio sources

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974aujph..27..837s&link_type=abstract

Australian Journal of Physics, vol. 27, Dec. 1974, p. 837-853.

Computer Science

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Atmospheric Refraction, F 2 Region, Ionospheric Propagation, Radio Sources (Astronomy), Radio Wave Refraction, Annual Variations, Atmospheric Optics, Critical Frequencies, Diurnal Variations, Ionospheric Disturbances, Ionospheric Electron Density, Ionospheric Sounding, Solar Activity Effects

Scientific paper

The dependence of ionospheric refraction on local time, zenith angle, and season is determined from 2000 measurements of source positions made with a radioheliograph at 80 MHz near the peak of the 1968-71 solar activity cycle. Variability in the refraction measurements is found to depend upon the zenith angle and season, and to be due mainly to ionospheric disturbances not usually detected by measurements of the F2 critical frequency. The equivalent thickness of the nocturnal atmosphere is derived from a quantitative comparison of angular refraction values with the critical frequency and its cardinal gradients. It is shown that the shape of the F2 layer is not dependent on the solar activity cycle and is not a sensitive measure of gas temperature.

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