We present the results of comparative analysis of geomagnetic field and total elec- tron content (TEC) variations. The analysis is based on the long series of data from the Siberian GPS network of the Institute of solar-terrestrial physics (ISTP) of Siberian Brunch of Russian Academy of Science (SB RAS) and Norilsk GPS station operated by the Geophysics Service of RAS (GS RAS.) ISTP SB RAS Siberian network makes continuous TEC measurements since 2012 and provides TEC-variation data with time resolution of 1 sec. The calculation of TEC is based on two-frequency phase measurements of GPS receivers. We analyzed TEC variations in two period ranges (0–10 min and 10–40 min), which are correspond to different types of iono- spheric disturbances. Magnetic intensity data were obtained from ISTP SB RAS observatories and INTERMAGNET sites. The common level of TEC disturbance is estimated by the index of the TEC-variation intensity Wtec. The index is calculated for all available GPS satellites with the highest elevation angle at every moment. This method allows to investigate continuous variations of TEC disturbances intensity. The Wtec was calculated for all the GPS data 2013. The Wtec dynamics features are revealed for different times of day, seasons and levels of geomag- netic activity for middle-latitude and Arctic regions. The response of the Wtec to sudden storm commencements (SSC) was also investigated.