Some Empirical Relations Between Cosmic Noise Absorption and the Critical Frequency of the F₂-Region

Abstract

Measurement of cosmic noise absorption has been carried out on 28·6 MHz at Waltair, during the period August 1965 to July 1966. The results of analysis, with special reference to the dependence of cosmic noise absorption on f₀F₂, are presented here. The total absorption during the day is found to vary as the square of f₀F₂, whereas during nights, the relation is linear. The nature of variation of total absorption with f₀F₂ is appreciably different for different seasons, with the index of f₀F₂decreasing systematically from summer to winter. The F-region contribution to total absorption is found to vary as the square of f₀F₂ during day and linearly during night.