The International GPS Service (IGS) Working Group on Ionosphere was created in 1998.rnSince then, the Scienti c community behind IGS, in particular CODE, ESA, JPL andrnUPC, have been continuosly contributing to reliable IGS combined vertical total electronrncontent (VTEC) maps in both rapid and nal schedules. The total electron content (TEC)rnis a vital and most dominant ionospheric parameter that can cause Global PositioningrnSystem (GPS) signal delays, signal degradation and in extreme cases loss of lock. Thisrnresults into ine cient operations of ground and space based Global Navigation SatelliternSystem (GNSS) applications. The study of TEC variability is, therefore, useful for GNSSrnusers in order to minimize errors where high levels of accuracy in measurements arernrequired. This paper presents the results of the Global GPS total electron content (TEC)rnvariation to better understand its typical periodic variability. The Global positioningrnSystem (GPS) TEC data was obtained from the International GPS Service (IGS) stationrnwith the highest data availability in the country and used to study the diurnal, seasonal,rnlatitudinal and longitudinal variability for 2008. The strength and characteristics of thernEIA were equally analyzed. In general, the diurnal variation of TEC shows a short- livedrnpre-dawn minimum, a steady early morning increase, followed by an afternoon maximumrnand gradual fall after sunset. The seasonal variability was greatest during the equinox,rnmoderate during the Winter solstices and least during the Summer solstices. Latitudinalrnstudy of TEC shows the clear e ect of EIA crest on the TEC variations in all the seasons.rnDuring this period of study, the so-called winter anomaly is seen near the equatorial andrnEIA crest region latitudes while it is found to be absent at low latitude outside the EIArncrest. Evidences from our study show that the EIA was enhanced during the morningrnhours, suppressed during afternoon hours and a secondary enhancement was also noticedrnafter sunset