Ionospheric irregularities measurement using Indian SBAS-GAGAN

In order to improve the performance of a navigation systems, scintillation studies and Ionospheric Total electron content (TEC) are important. The amplitude scintillation index (S₄), S₄ corrections and Rate of change of TEC index (ROTI) parameters are analysed for different seasons. For the analysis Visakhapatnam station (Lat: 17.78, Long: 83.22) and Lucknow (Lat: 26.76, Long: 80.88) station, GAGAN receiver data for the year 2016 is considered based on four quiet days and four disturbed days and consider the highest Kp index values for Visakhapatnam station and Lucknow station. This work shows the variation of S₄ index and ROTI parameter variation during different seasons for both the stations. The correlation coefficient (CC) of S₄ index and ROTI are presented. The results show that the CC are high for disturbed days compared to the quiet days for both the considered stations. For Lucknow station, it is observed that CC values are high compared to the Visakhapatnam station.