A paper on the EQUUREUS/PHOENIX ultraviolet imaging device developed by our laboratory has been published.

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

 

Details are in the caption following the image
Flight model of PHOENIX (Kuwabara et al., 2025).

 

Details are in the caption following the image
Examples of images of the Earth’s plasmasphere observed by PHOENIX in May 2023 (Kuwabara et al., 2025).