Ionospheric amplitude and phase scintillations at multiple frequencies

Analysis of simultaneous scintillation observations of amplitude and phase from the ATS-6 beacon experiments for signals at 40 and 140 MHz is presented. It was found that a combination of 1 sec sampling period and a value of about 200 for the filter-coefficient for a digital high pass filter provides a reasonable value of scintillation index. The autocorrelation functions behave in accordance with the expectations of the theory; for strong scintillation cases the data show broadening of spectrum and a relative difference in the behavior of autocorrelation functions, but in the case of phase scintillations the slope of the spectrum varies from 2.1 to 2.6 and no systematic trend was observed in passing from weak scintillations to strong ones.