Effect of the solar eclipse of may 20, 1966, on the ionospheric absorption of cosmic noise on 25 Mc/s

Details Effect of the solar eclipse of may 20, 1966, on the ionospheric absorption of cosmic noise on 25 Mc/s Effect of the solar eclipse of may 20, 1966, on the ionospheric absorption of cosmic noise on 25 Mc/s

Dec 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29.1663o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 12, pp. 1663-1668

Physics

3

Scientific paper

Measurements of cosmic noise absorption (A2 method) on 25 Mc/s in south-east Bulgaria during the solar eclipse of May 20, 1966, show a significant decrease of absorption by about 0.5 dB at the time of maximum eclipse. The contribution of the D- and E-regions of the ionosphere to this eclipse effect is only 0.22 decibels, determined by a comparison with simultaneous Al absorption measurements (pulse reflection) on 3.86 Mc/s. There remains a significant eclipse effect which must be ascribed to a decrease of electron density in the lower F-region. The eclipse variation of the maximum F2-layer electron density appears not to be representative for this F-region effect.

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