Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim

Takumi Kishimoto; Kumiko K. Nobukawa; Ayaki Takeda; Takeshi G. Tsuru; Satoru Katsuda; Kazuhiro Nakazawa; Koji Mori; Masayoshi Nobukawa; Hiroyuki Uchida; Yoshihisa Kawabe; Satoru Kuwano; Eisuke Kurogi; Yamato Ito; Yuma Aoki

doi:10.1117/12.3019559

21 August 2024 Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim

Takumi Kishimoto, Kumiko K. Nobukawa, Ayaki Takeda, Takeshi G. Tsuru, Satoru Katsuda, Kazuhiro Nakazawa, Koji Mori, Masayoshi Nobukawa, Hiroyuki Uchida, Yoshihisa Kawabe, Satoru Kuwano, Eisuke Kurogi, Yamato Ito, Yuma Aoki

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130935J (2024) https://doi.org/10.1117/12.3019559
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Measurements of the upper atmosphere at ∼ 100 km are important to investigate climate change, space weather forecasting, and the interaction between the Sun and the Earth. Atmospheric occultations of cosmic X-ray sources are an effective technique to measure the neutral density in the upper atmosphere. We are developing the instrument SUIM dedicated to continuous observations of atmospheric occultations. SUIM will be mounted on a platform on the exterior of the International Space Station for six months and pointed at the Earth’s rim to observe atmospheric absorption of the cosmic X-ray background (CXB). In this paper, we conducted a feasibility study of SUIM by estimating the CXB statistics and the fraction of the non-X-ray background (NXB) in the observed data. The estimated CXB statistics are enough to evaluate the atmospheric absorption of CXB for every 15 km of altitude. On the other hand, the NXB will be dominant in the X-ray spectra of SUIM. Assuming that the NXB per detection area of SUIM is comparable to that of the soft X-ray Imager onboard Hitomi, the NXB level will be much higher than the CXB one and account for ∼ 80% of the total SUIM spectra.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Takumi Kishimoto, Kumiko K. Nobukawa, Ayaki Takeda, Takeshi G. Tsuru, Satoru Katsuda, Kazuhiro Nakazawa, Koji Mori, Masayoshi Nobukawa, Hiroyuki Uchida, Yoshihisa Kawabe, Satoru Kuwano, Eisuke Kurogi, Yamato Ito, and Yuma Aoki "Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130935J (21 August 2024); https://doi.org/10.1117/12.3019559

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