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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Atmospheric modes excited by the 2021 August eruption of the Fukutoku-Okanoba volcano, Izu–Bonin Arc, observed as harmonic TEC oscillations by QZSS

Fig. 4

Short period TEC disturbances (positive/negative changes expressed in red/blue) as functions of time (horizontal axis) and the distance from the Fukutoku-Okanoba volcano (vertical axis) for all the satellite–station pairs showing the eruption signatures. Thin lines, connecting points of clear positive anomalies, have a slope corresponding to the acoustic wave propagation speed (0.8 km/s)

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