, Volume 55, Issue 5, pp 296-308

Infrasound oscillations in the ionosphere affected by high-power radio waves

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We present the results of filtering in the range of periods 5.6–6.7 min of temporal variations in the Doppler frequency shift of the ionosphere-reflected radio signals from the high-frequency vertical ionospheric-sounding radar located near the city of Kharkov during ionospheric plasma modification by high-power periodic (with 6-min period) radio waves of the Sura facility. It is found that switching on and off a series of pulses with 3-min duration and the same pause launched a damped wave process with 6-min period, a delay time of about 30–50 min, and an apparent propagation velocity of about 320–530 m/s. The quasi-periodic variation amplitude of the Doppler frequency shift was 10–40 MHz. The corresponding relative-perturbation amplitude of the electron number density was about 0.1–0.3%. Detected oscillations is evidence that damped infrasound density waves can be generated in the upper atmosphere.

Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 55, No. 5, pp. 327–340, May 2012.