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

Fig. 6

From: Observations of equatorial plasma bubbles using a low-cost 630.0-nm all-sky imager in Ishigaki Island, Japan

Fig. 6

Temporal variation of the S4 index during the sequential passage of EPBs across Ishigaki Island on February 14, 2015. The data from three GPS satellites are shown in the top three panels (a–c) and those from three geosynchronous satellites are shown in the bottom three panels (d–f). The intervals of EPBs detected by the low-cost airglow imager on the ray-path of the signal are highlighted green. The elevation angle of the satellite is overplotted

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