ИСТИНА

In these report TEC effects of annular solar eclipse June 21, 2020 are presented. The eclipse started over Africa about 04:47 UT with a path of totality passing over China and ended in the Pacific Ocean at 08:32:17. The GPS observations from IGS permanent GPS network of the Chine were used to observe the response of TEC to the solar eclipse under quiet geomagnetic conditions. A maximal magnitude amount near M=0.98. The effects of the eclipse in diurnal variations and more distinctly in the variations of TEC along individual satellite passes were detected. The trough-like variations with a gradual decrease and followed by an increase of TEC at the time of the eclipse were observed over a large spatial area. The maximal depression of TEC amounted to 3-4 TECU. We brought out that the TEC depression amplitude depends linearly on the eclipse magnitude with a correlation coefficient of R ≈ 0.73.The maximum depression over all stations located at the maximum path of the solar eclipse was observed. The delay of a minimum level of TEC with respect to the maximum phase of the eclipse was about 30-40 min. The delay, as well as amplitude, demonstrates linear dependence on magnitude of the eclipse with a correlation coefficient of R ≈ 0.85.We found out features of annular eclipse against typical total solar eclipse which associated with occurrence of residual source of ionization. The two-dimensional TEC maps show that the eclipse produced remarkable changes in the structure of the ionosphere. The differential TEC maps demonstrate also that pass of maximal depression of TEC agree with passing eclipse shadow on earth. The complex pattern in the spatial-temporal TEC distribution presents the important role in the dynamic processes in the ionosphere during the eclipse. The work is partly supported by RFBR, grant 19-05-00570.