Fig. 6From: Periodic oscillations of Doppler frequency excited by the traveling ionospheric disturbances associated with the Tonga eruption in 2022The TEC data observed at a GEONET station in Japan. These data were derived by applying a bandpass filter with a bandwidth of 3 mHz to 5 mHz. The top (a), middle (b) and bottom (c) panels show the temporal variations of TEC observed with GPS PRN 8, 16, and 27, respectivelyBack to article page