CONSISTENT QUASI-PERIODIC VARIATIONS OF THE GEOMAGNETIC PULSATION LEVEL AND DOPPLER FREQUENCY SHIFT OF DECAMETRIC RADIO WAVES ASPECT-SCATTERED BY ARTIFICIAL FIELD-ALIGNED IONOSPHERIC IRREGULARITIES

摘要

We present the results of experimental studies of consistent quasi-periodic variations of the geomagnetic-pulsation level and effective Doppler frequency shift of decametric radio waves aspectscattered by artificial field-aligned ionospheric irregularities. For processing of signals, we used a system spectral analysis and a correlation analysis. It is shown that quasi-periodic variations of the effective Doppler frequency shift are caused by geomagnetic-field pulsations with an amplitude of 0.5–1.0 nT and a period of 50–150 s. Estimated amplitudes of the quasi-periodic and aperiodic drift velocities of the ionospheric irregularities appeared close to 5–10 and 15–30 m/s, respectively.