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A paper on the ultra-compact probe EQUUREUS and its ultraviolet imaging device PHOENIX, developed by Assistant Professor Masaki Kuwahara of Rikkyo University and Associate Professor Kazuo Yoshioka of our laboratory, has been published in the Journal of Geophysical Research: Space Physics. Using a tiny telescope the size of a can of coffee, we have successfully imaged the entire Earth’s plasma sphere!   【The article information】 Kuwabara, M., Yoshioka, K., Hikida, R.,Murakami, G., Yoshikawa, I., Nakajima, S., et al. (2025). Global and sequentialimaging observation of the Earth’s plasmasphere by PHOENIX onboard EQUULEUS. Journal of Geophysical Research: Space Physics, 130,e2024JA033389. https://doi.org/10.1029/2024JA033389