Sorry, this entry is only available in Japanese.

A paper co-authored by Gaku Kinoshita, a first-year doctoral student in Yoshioka Laboratory, has been published in Earth, Planets and Space! The Mercury exploration mission BepiColombo is currently traveling through interplanetary space toward its goal of entering Mercury’s orbit at the end of 2026 (see this article for the Yoshioka Lab’s contributions to the BepiColombo mission!). During its cruise phase, BepiColombo has observed numerous solar plasma ejections, contributing valuable data for exploring the inner heliosphere. This newly published paper summarizes seven years of BepiColombo’s cruise-phase observations and discusses the mission’s contributions to space weather research. Mr. Kinoshita has been leading the calibration and analysis of cosmic ray monitoring instruments onboard BepiColombo (see Kinoshita et al., 2025, JGR), and he wrote the sections describing the instruments and the analysis of solar events (mainly Sections 5.3–5.4). Paper informationBeatriz Sanchez-Cano … Gaku Kinoshita (12th author) et al.“BepiColombo cruise science: Overview of the mission contribution to heliophysics,” Earth, Planets and Space, 77, 114 (2025).https://doi.org/10.1186/s40623-025-02256-z

A research paper on hydrogen originating from comets, authored by Dr. Yudai Suzuki (a 2022 graduate of the Kazuo Yoshioka Laboratory, currently a postdoctoral researcher at ISAS/JAXA), Associate Professor Kazuo Yoshioka, Professor Ichiro Yoshikawa, and others, has been published. Comets are considered one of the potential sources of Earth’s water, and understanding them is essential for unraveling the history of terrestrial evolution. Water is released from the nuclei of comets, and observing the hydrogen produced through its dissociation is a valuable method for understanding cometary activity. In this study, Dr. Suzuki developed a radiative transfer model of ultraviolet emissions from hydrogen that includes the physical process of “multiple scattering.” He demonstrated that the model successfully reproduces the comet observations made by the ultraviolet space telescope Hisaki, developed primarily by the Yoshioka and Yoshikawa laboratories. The study also used this model to evaluate the observational capabilities of the hydrogen detector onboard the upcoming Comet Interceptor mission, which the Yoshioka Laboratory is leading. [Paper Information]Y. Suzuki, K. Yoshioka, K. Masunaga, H. Kawakita, Y. Shinnaka, G. Murakami, T. Kimura, F. Tsuchiya, A. Yamazaki, I. Yoshikawa. 2025. Contribution of multiple scattering to the Lyman alpha radiance distribution in cometary comae. Icarus, 441, 116720. doi: 10.1016/j.icarus.2025.116720

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      

Sorry, this entry is only available in Japanese.

Sorry, this entry is only available in Japanese.

Sorry, this entry is only available in Japanese.

Sorry, this entry is only available in Japanese.

Sorry, this entry is only available in Japanese.