The hard X-ray scintillation spectrum and its space distribution are measured. The relation between hard X-ray intensity, pressure of filling gas and toroidal current is discussed.

Based on the temporal covariance of logarithmic amplitude, analytical expression was obtained for aperture receiving power spectrum of atmospheric scintillation of satellite-to-ground downlink.

The effect of the receiving aperture and outer scale of turbulence on the power spectrum of atmospheric scintillation was analyzed.