Abstract
Abstract Results of ionospheric pulse absorption measurements (A1 method) on 3.86 Mc/s in south-east Bulgaria during the solar eclipse of May 20, 1966, can be quantitatively interpreted by a two-layer model, dividing the total absorption into a contribution from a parabolic E-layer, calculated from simultaneous ionogram data, and a contribution from an idealized ‘thin’ D-layer, obeying an effective recombination law. Experimental indications of a possible non-uniform brightness distribution of the X-ray emission over the Sun's disc are discussed. In agreement with the results of an earlier study of the 1961 solar eclipse, the contributions of the E- and D-layers to total absorption are found to be nearly equal, confirming the recent models of electron density distribution and collision frequency profiles in the D- and E-regions.
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