Fig. 1From: Comparison of GPS TEC measurements with IRI TEC prediction at the equatorial latitude station, Chumphon, ThailandDiurnal median values of GPS TEC and IRI-2007 TEC at the Chumphon station for 0000 LT, 0600 LT, 1200 LT and 1800 LT during the period 2004–2006.Back to article page