Abstract
The scintillation has been monitored at Rajkot using the VHF (250 MHz) signals from geostationary satellite FLEETSAT at 73°E since 1986. The paper describes the observed characteristics of scintillation such as its noctural occurrence pattern, seasonal, geomagnetic and solar activity dependence. Employing digital data acquisition and power spectral analysis techniques, quantitative parameters such as the scintillation index S4, upper roll of frequency and spectral slope are derived and discussed in terms of the parameters of causative plasma irregularities. Spaced receiver technique and cross correlation analysis is employed to determined the characteristic scale size and velocity of the irregularities. A comprehensive study of the above parameters throws some light on the possible plasma instability mechanism responsible for the generation of those irregularities. The effects of the irregularities in terms of signal statistics such as cumulative amplitude distribution functions, fade rate, message reliability and bit error on a typical modern communication system are computed and presented.
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