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Ionospheric scintillation is the rapid change in the phase and/or theamplitude of a radio signal as it passes through small scale plasma densityirregularities in the ionosphere. These scintillations not only can reduce theaccuracy of GPS/Satellite Based Augmentation System (SBAS) receiverpseudo-range and carrier phase measurement but also can result in a completeloss of lock on a satellite. Scintillation in the ionosphere varies as the sunspot number (SSN), Geomagnetic index (o < Kp < 9), time of year, time of day,geographical position. Most scintillation occurs for a few hours after sunsetduring the peak years of the solar cycle. Typically delay locked loop/phaselocked loop designs of GPS/SBAS receivers enable them to handle moderate amountif scintillations. Consequently, any attempt to determine the effects ofscintillations on GPS/SBAS must consider both predictions of scintillationactivity in the ionosphere and residual effect of this activity afterprocessing by a receiver. In this work dual frequency (f1 = 1.5 GHz, f2 = 1.2GHz) GPS data recorded at low latitude station Varanasi (Geographic latitude250 18/ N, longitude 820 59/ E) have been analyzed to monitor the amplitudescintillation index (S4) from January 2009 to December 2009. These analyzeddata is used to study the monthly and seasonal variability of ionosphericplasma bubbles at low latitude. We have studied the power spectral density ofthe signal and using it we have calculated the estimated scintillation patternvelocity.

Statistics of Night time Ionospheric Scintillation Using GPS data at low latitude ground station Varanasi