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The study of variations of different ionospheric layers at the day of solar eclipse and the calculation of the recombination factor of electrons «1), were our aim. In this regard, the measurements were made with an ionospheric vertical sounding instrument at the interval IS to I minutes at the control day and the day of solar eclipse. The ionospheric data extracted from the ionospheric records (ionograms) and electron density variations with height of the
different layers were obtained based on the relation between electron density and frequency of the layers. Finally the recombination factor for F I layer was calculated. The behaviors of the
electron density variations indicate a rapid decrease of ionization of different ionospheric layers.