Relative delays in the response of oblique SW-sounding signals during geomagnetic disturbances

The ionospheric response to geomagnetic SI and SC disturbances and explosiv e processes in the magnetotail were investigated. Using a mutual correlatio n analysis of the time series of the Doppler frequency shift, the delay of the signal response to local time at the receiving point on the reference p aths relative to the response on the base path has been derived. It has bee n established that the relative delays of the signal spectrum disturbances range between -27 and +55 s, the quasi-period of frequency variations is 50 -150 s, and the frequency shifts, from fractions of a Hertz to 2 Hz.