In this paper, the results of our observations on Al-method ionospheric absorption of radio waves on 1.8 and 2-2 MHz during the solar eclipse of 16 February 1980 are presented. The absorption decreased by about 41% and 46 % of the normal value respectively at the above two frequencies at Ahmedabad following the maximum phase of the eclipse (about 77 ~ of full disc) with a delay of 18 minutes. The quantity At(f) which is a measure of J Nvdh is now examined for better clarity of the influence of the changes in the E-layer. The results are discussed in relation to the observations of the ionizing radiations from the sun, changes in the electron density, recombination rate and absorption in the underlying D and E regions.

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