Ionospheric manifestations of geomagnetic pulsations at high latitudes

The results of an experiment on synchronous recording of geomagnetic pulsat ions and variations in the Doppler frequency shift (DFS) at Norilsk station (geomagnetic coordinates lambda = 64.2 degrees, Phi = 160.4 degrees, L = 5 .3) in February-March 1995-1996 are analyzed. A digital ionosonde with oper ating frequencies in the range 1-20 MHz allowed us to receive radio signals reflected from the ionospheric E-s and F2 layers. The registration of geom agnetic pulsations was carried out with an induction magnetometer in the fr equency range 0.2-0.005 Hz. Seven fragments of the DFS variations were anal yzed during the appearance of the Pi2 pulsations, and two fragments were an alyzed during the period of Pc5-oscillation observation. Regular Pc5 pulsat ions with frequencies of 5-15 mHz were accompanied by synchronous variation s in the DFS with a high degree of correlation. Almost no correlation has b een observed during the observation of Pi2 pulsations, although the main fr equencies in the spectra of geomagnetic pulsations and variations in the DF S coincide.