scanning frequency range with time interval from 3 to 30 minutes between each sounding; (b) continuously backscattering at fixed frequencies during the period from 8 to 25 minutes when the amplitudes and Doppler frequency shifts were registered. Some examples of these data are given. Figure 2 presents several backscatter ionograms taken in the frequency scan mode using signals from the F region. The simultaneous time variations of Doppler frequency shifts (in Hz) taken at the fixed frequencies 3.5 MHz and 5.5 MHz on February 16, 1994 are also shown. Figure 3 shows a sequence of backscatter ionograms, with reflections from auroral forms, taken during the storm on February 16, 1994. The frequency scan mode is used here. An interesting feature of these ionograms is the lowest trace which probably belongs to a slant F-layer. Figure 4 shows the three-dimensional impression of amplitudes and the time variations of Doppler frequency shifts taken at a fixed frequency of 4 MHz during a geomagnetic storm on January 12, 1994. The time interval is from 21.20 UT until 21.28 UT. The data in Fig.4 shows wave-like variations of both amplitudes and Doppler shifts with periods of 2-3 minutes. Most probably these wave-like variations of the ionospheric parameters are connected with the infrasonic waves produced by the movements of auroral arcs. The data in Fig. 4 clearly demonstrate equatorward shift of the region of wave-like variations of amplitude from a distance of 1800 km to a distance of 800 km in 8 minutes. The corresponding