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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

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. 6

a High-pass filtered slant TEC time series 5:20–8:20 (blue) and 8:20–11:20 (green) UT, at the 2007 station observed using J07 satellite. b Frequency components of the 2-h data 5:20–7:20 UT and 8:20–10:20 UT indicate that the peak powers mostly decayed in the second time window. c We select the three strong peaks (3.7, 4.4, and 5.4 mHz) and compare their powers obtained from a 2-h time window moving with a 1-h time step (horizontal bars indicate the periods representing the frequency spectra). The red curve in c indicates gentle afternoon decrease of vertical TEC above the volcano from GIM

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