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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

The dynamic spectrums of the received radio waves for 3 h (08:00–11:00 UT) observed on January 15th, 2022. The top panel (a) shows the dynamic spectrum at the frequency of 3925 kHz observed at Oarai station. The other panels (b), (c) and (d) show the dynamic spectrums of the 5006-kHz radio wave observed at Kokura, Onna, Awaji, respectively

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