Features of the Wave Disturbances in the Ionosphere During Periodic Heating of the Plasma by the “Sura” Radiation

We present the results of observations of the Doppler-spectrum and Doppler-frequency shift variations of the ionosphere-reflected radio signals from a high-frequency vertical-sounding radar when the ionospheric plasma is affected by the high-power periodic radiation of the “Sura” heating facility. The distance from the heater to the Doppler radar is about 960 km. It has been confirmed that high-power radiation leads to the generation (amplification) of wave disturbances in the parameter range of internal gravity waves (periods 10–30 min and velocities 360–460 m/s). Soliton-like wave packets with a period of 10–15 min, a duration of 20–30 min, and a relative amplitude of electron-density perturbations from 3 to 8 % have been detected. The same parameter for other wave disturbances was 1–3 %. It has been confirmed that the generation efficiency of periodic disturbances in the parameter range of internal gravity waves depends significantly on the heater operation regime.