The variations of ionospheric total electron content during geomagnetic storm

This paper presents the variations of the ionospheric TEC calculated from differential Doppler records. The data were obtained by receiving NNSS beacon signals at Xinxiang (23.7 deg N, mag. lat.) and Manzhouli (38.1 deg N, mag. lat.), during 1982 and 1983, respectively. The results show that the rms of deviations from the month medians for TEC during magnetic storms is larger than those during the period of the quiet condition, and that there is a good linear correlation between the rms deviations of TEC and of the 10.7-cm solar radio flux, and/or rms values of magnetic index. These facts indicate that a close relation exists among the storm-time behaviors of ionospheric TEC and the abnormal variations of 10.7-cm solar radio flux and the geomagnetic storm activities.