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We present the results of comprehensive studies of the spatio-temporal structure of the artificial ionospheric plasma turbulence created by powerful radio emission over the "Sura" heating facility. The elaborated methods of the transmitter-receiver operation control, wide-band signal recording, digital filtering and spectral analysis of the stimulated electromagnetic emissions and short radio pulses are used for diagnostics. Novel data are obtained on the evolution of the Langmuir and upper-hybrid turbulence spectrum, the altitude distribution of the plasma wave decay rates, and the amplitude-phase characteristics of the test signals under wide-band sounding of the ionospheric plasma.

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