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

Fig. 3

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

Fig. 3

Procedure of image processing: a 2-min average all-sky image (same as Fig. 2c); b background image obtained by averaging all the images obtained in the surrounding 1-h interval; c deviation image derived by calculating the “percentage of the 2-min average image (Fig. 3a) to the 1-h background image (Fig. 3b)”; d raw all-sky image from OMTI ASI obtained at the same time in the same place

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