ИСТИНА

The complex of traditional ground observations methods (a vertical sounding ionosonde and magnetometers) situated near Murmansk (polar latitudes) was supplemented with measurements of total electron content (TEC) by means of navigational satellite signals. The measurements of satellite Doppler signals were carried out at spaced points which were located in the auroral and subauroral zones. Availability of two independent Doppler measurements gives an opportunity to obtain TEC values which can be used for investigation o f ionosphere structures and their dynamics in conditions of disturbance. Use of ground data permitted to interpret structural variations of latitudinal profiles of vertical electron content, in particular, the phenomenon of creation and change of the ionosphere trough.