Effects of solar eclipses in the ionosphere: Results of Doppler sounding: 1. Experimental data

The results of experimental studies of variations in the Doppler frequency shift at a vertical radio path caused by partial solar eclipses are presented. Eclipses were observed near Kharkov in 1999?C2008. The eclipse phase varied from 0.24 to 0.78. It is shown that the eclipses caused sign-changing variations in the Doppler frequency shift, deformations of the Doppler spectra, and also quasi-periodic changes in the Doppler frequency shift. This was manifested in changes in the electron concentration, generation of wave processes, and plasma motions caused by the eclipses.