Japan Geoscience Union Meeting 2022

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[E] Poster

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM13] Coupling Processes in the Atmosphere-Ionosphere System

Wed. Jun 1, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (4) (Ch.04)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), convener:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Institute of Space Science, National Central University), convener:Yue Deng(University of Texas at Arlington), Chairperson:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Atsuki Shinbori(Institute for Space-Earth Environment Research (ISEE), Nagoya University)


11:00 AM - 1:00 PM

[PEM13-P11] A pilot study for tomographic reconstruction of ionospheric O+ distribution from ISS-IMAP/EUVI data

*Shin ya Nakano1,2, Yuta Hozumi3, Akinori Saito4, Ichiro Yoshikawa5, Atsushi Yamazaki6, Kazuo Yoshioka5, Go Murakami6 (1.The Institute of Statistical Mathematics, 2.Center for Data Assimilation Research and Applications, Joint Support Center for Data Science Research, 3.National Institute of Information and Communications Technology, 4.Graduate School of Science, Kyoto University, 5.Graduate School of Frontier Sciences, The University of Tokyo, 6.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

Keywords:ionosphere, oxygen ion density distribution, extreme ultraviolet observation

An extreme ultraviolet (EUV) imager, EUVI-B, on board the International Space Station (ISS) under the International Space Station-Ionosphere-Mesosphere-Atmosphere Plasmasphere cameras (ISS-IMAP) mission was originally intended to observe EUV emissions at 83.4 nm scattered by O+ ions. However, our previous study (Nakano et al., 2021) has reported that EUVI-B mostly observed 91.1 nm emission due to recombination between O+ ions and electrons. This result suggests that the observed signal is approximately proportional to the line-of-sight integral of the square of O+ density and that the EUVI-B data can be used for tomographic reconstruction of O+ distribution in the ionosphere.

In this study, we conduct a pilot study for reconstruction oxygen ion distribution from the EUVI-B data. We use multiple images to estimate the three-dimensional O+ distribution in the vicinity of the ISS orbit of the low-latitude ionosphere. We will report the current status and future prospect of our study based on the ISS-IMAP/EUVI-B data.

Reference
S. Nakano, Y. Hozumi, A. Saito, I. Yoshikawa, A. Yamazaki, K. Yoshioka, and G. Murakami, EUV signals associated with O+ ions observed from ISS-IMAP/EUVI in the nightside ionosphere, Earth Planets Space, v. 73, 151, doi:10.1186/s40623-021-01479-0, 2021.