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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Periodic oscillations of Doppler frequency excited by the traveling ionospheric disturbances associated with the Tonga eruption in 2022

Fig. 2

The dynamic spectrums of the received radio waves observed at Sarobetsu on January 15th, 2022. The top panel (a) shows the dynamic spectrum at the frequency of 5006 kHz over a duration of 3 h (08:00–11:00 UT). The middle panel (b) is the enlarged depiction of top panel, specifically from 09:30 to 10:00 UT. The bottom panel (c) shows the dynamic spectrum the 6055-kHz radio wave

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