Multifrequency studies of ionospheric scintillations

Simultaneous scintillation data from the ATS-6 Radio Beacon Experiments for signals at 40, 140, and 360 MHz offer the opportunity to study the frequency dependence of the scintillation phenomenon. Using these data variations of the spectral index, correlation coefficient, and the correlation interval are investigated. It is found that for weak scintillations, the spectral indices lie between 1.5 and 1.7. When the scintillation is strong, the spectral indices vary from about 1.4 to 0.7. The correlation coefficients are found to decrease for increasing scintillation level. The interesting behavior of the correlation intervals as functions of signal frequency is also discussed. The observational results are compared with theoretical predictions.

[1]  Robert K. Crane,et al.  Spectra of ionospheric scintillation , 1976 .

[2]  C. Rino,et al.  Some new results on the statistics of radio wave scintillation 1. Empirical evidence for Gaussian statistics , 1976 .

[3]  K. Yeh,et al.  Effects of multiple scattering on scintillation of transionospheric radio signals , 1974 .

[4]  C. Liu,et al.  Ionospheric irregularities causing scintillation of GHz frequency radio signals , 1974 .

[5]  P. L. Dyson,et al.  In situ measurements of the spectral characteristics of F region ionospheric irregularities , 1974 .

[6]  C. Rino,et al.  An empirical model for average F‐layer scintillation at VHF/UHF , 1973 .

[7]  Clifford L. Rufenach,et al.  Power‐law wavenumber spectrum deduced from ionospheric scintillation observations , 1972 .

[8]  M. Papagiannis,et al.  Measurement and interpretation of power spectrums of ionospheric scintillation at a sub-auroral location , 1969 .

[9]  K. Budden.  The theory of the correlation of amplitude fluctuations of radio signals at two frequencies, simultaneously scattered by the ionosphere , 1965 .

[10]  K. Budden.  The amplitude fluctuations of the radio wave scattered from a thick ionospheric layer with weak irregularities , 1965 .

[11]  G. Swenson,et al.  F-region irregularities studied by scintil- lation of signal from satellites , 1964 .

[12]  B. H. Briggs,et al.  On the variation of radio star and satellite scintillations with zenith angle , 1963 .

[13]  K. Yeh,et al.  A theoretical study of the ionospheric scintillation behavior caused by multiple scattering , 1975 .

[14]  D. G. Singleton,et al.  Power spectra of ionospheric scintillations. , 1974 .

[15]  J. R. Jokipii,et al.  Interplanetary Scintillations and the Structure of Solar-Wind Fluctuations , 1970 .

[16]  S. Bowhill.  Ionospheric irregularities causing random fading of very low frequencies , 1957 .

[17]  J A Ratcliffe,et al.  Investigation of molecular motions in supercooled liquids by Mossbauer scattering D C Champeney and F W D Woodhams Some Aspects of Diffraction Theory and their Application to the Ionosphere , 1956 .