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14 December 20 June 20-minute intervals analysed atmos bifurcation Chatterjee computation constant continuity equation critical frequency daily variation decrease dNjdt drift velocity eclipse day eclipse of 20 Egedal elec electric field electrojet electron loss electron production electrostatic polarization enhanced conductivity equatorial F region F2 layer following the eclipse h'-f records height profiles heights of 250 horizontal force indirect effects intensity of ionizing ionizing radiation ionosphere June and 14 Kodaikanal levels line current low latitude stations Magn magnetic magnitudes maximum electron density maximum phase Mc/sec minimum in electron Minnis minutes summer eclipse minutes winter eclipse movement term N-t curves Observed electron density obtained occurred order to examine plotted present authors quiet days Ratcliffe rate of electron reduction respective control days scale height Schmerling shown in Fig solar disc Solar Eclipses SUBRAHMANYAM summer and winter Terr Thomas and Robbins tion true heights values variation in horizontal vertical drift visible fraction