Fig. 3From: Ionospheric disturbances over South America related to Tonga volcanic eruptionIonospheric dTEC map over South America on 15 Jan 2022: (a) TID-1 at 11:43 UT (highlighted by a blue circle), (b) TID-2 at 12:04 UT. The color bar shows the amplitude of dTEC oscillationBack to article page