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[1] The analysis of field strength fluctuations of radio waves in the wavelength band l = 2 cm of radio occultation measurements between orbital station MIR and a geostationary satellite is presented. Examples of field strength E dependences on altitude H 0 of the ray path are given. We find two types of fluctuations connected to turbulence and stratified formations in the atmosphere. The RMS deviations of field strength are investigated as function H 0 for both types. The frequency spectra of the field strength scintillation G(F ) are analyzed to determine a spectral index n and characteristic frequency of fluctuations F 0 for different minimum altitudes of the ray path H 0 . It is shown that the troposphere at H 0 < 7 km in the high-frequency part of the spectrum is described by a function G(F ) $ F Àn , where the spectral index n on average is equal to 2.5, which corresponds to the theoretical value for the Kolmogorov spatial spectrum. In the stratosphere at H 0 = 15-35 km the mean value n equals 3.6, and only in 13% of the cases there are spectra that are in agreement with the Kolmogorov law. At the basis of the analysis of the connection between the spatial spectrum of the refractive index fluctuations and the frequency spectrum of field strength fluctuations, we discuss the application of the radio occultation technique for investigation of the atmospheric inhomogeneities.INDEX TERMS: 6904 Radio Science: Atmospheric propagation; 6994 Radio Science: Instruments and techniques; 0659 Electromagnetics: Random media and rough surfaces; KEYWORDS: radio occultation, atmosphere, wave, scintillation Citation: Yakovlev, O. I., S. S. Matyugov, and V. A. Anufriev, Scintillations of centimeter waves and the atmospheric irregularities from radio occultation data,

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We analyze ionospheric fluctuations of decimeter radio waves on occultation polar paths between the navigational GPS satellites and the satellite CHAMP. Time dependences of the variance of the signal amplitude and amplitude fluctuation spectra under high solar activity in OctoberNovember 2003 are presented. The behavior of the signal amplitude fluctuations during occultation ionospheric sounding in the polar regions in different time of the day and in the equatorial regions in the daytime are considered. Radio-wave fluctuations are related to the solar-activity manifestations. It is shown that during strong solar-flare activity, intense small-scale plasma irregularities are excited in the polar ionosphere.

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