Study of Ionospheric Equatorial Plasma Bubbles Based on GOLD Observations

Using peak electron density data from the Global-scale Observations of the Limb and Disk (GOLD) imager, equatorial plasma bubbles (EPBs) from October 2018 to December 2022 are identified in this paper. The occurrence characteristics of EPBs is statistically analyzed. The results show that EPBs have strong seasonal and longitudinal variations in the range of longitude −60°–0° and magnetic latitude 25° to −20°: (a) The occurrence of EPBs is highest during the spring and autumn equinoxes and lowest during the summer. (b) Equinox asymmetry is found, that the occurrence of EPBs is much higher in autumn than in spring. (c) A peak in the longitudinal distribution of EPBs is observed, with the highest occurrence occurring between −10° and 0° longitude. Additionally, a second peak is evident at −50° longitude in autumn. The GOLD imager is capable of conducting prolonged observations of EPBs in the same region from space, thereby offering a novel perspective on EPBs.