SUIM project: measuring the upper atmosphere from the ISS by observations of the CXB transmitted through the Earth rim

arXiv - PHYS - Atmospheric and Oceanic Physics Pub Date : 2024-07-24 DOI:arxiv-2407.16922

Kumiko K. Nobukawa, Ayaki Takeda, Satoru Katsuda, Takeshi G. Tsuru, Kazuhiro Nakazawa, Koji Mori, Hiroyuki Uchida, Masayoshi Nobukawa, Eisuke Kurogi, Takumi Kishimoto, Reo Matsui, Yuma Aoki, Yamato Ito, Satoru Kuwano, Tomitaka Tanaka, Mizuki Uenomachi, Masamune Matsuda, Takaya Yamawaki, Takayoshi Kohmura

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Abstract

The upper atmosphere at the altitude of 60-110 km, the mesosphere and lower thermosphere (MLT), has the least observational data of all atmospheres due to the difficulties of in-situ observations. Previous studies demonstrated that atmospheric occultation of cosmic X-ray sources is an effective technique to investigate the MLT. Aiming to measure the atmospheric density of the MLT continuously, we are developing an X-ray camera, "Soipix for observing Upper atmosphere as Iss experiment Mission (SUIM)", dedicated to atmospheric observations. SUIM will be installed on the exposed area of the International Space Station (ISS) and face the ram direction of the ISS to point toward the Earth rim. Observing the cosmic X-ray background (CXB) transmitted through the atmosphere, we will measure the absorption column density via spectroscopy and thus obtain the density of the upper atmosphere. The X-ray camera is composed of a slit collimator and two X-ray SOI-CMOS pixel sensors (SOIPIX), and will stand on its own and make observations, controlled by a CPU-embedded FPGA "Zynq". We plan to install the SUIM payload on the ISS in 2025 during the solar maximum. In this paper, we report the overview and the development status of this project.

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SUIM项目：通过观测穿过地球边缘的CXB，从国际空间站测量高层大气

在所有大气层中，由于现场观测的困难，高度在60-110千米的高层大气，即中间层和低温层（MLT）的观测数据最少。以往的研究表明，对宇宙X射线源进行大气层掩星是研究中间层和低温层的一种有效技术。为了持续测量多层大气层的大气密度，我们正在开发一种专门用于大气观测的 X 射线照相机 "观测高层大气的 Soipix 作为 Iss 实验任务（SUIM）"。SUIM 将安装在国际空间站（ISS）的暴露区域，面向国际空间站的冲压方向，指向地球边缘。通过观测穿过大气层的宇宙 X 射线背景（CXB），我们将通过光谱法测量吸收柱密度，从而获得高层大气的密度。X 射线相机由一个狭缝准直器和两个 X 射线 SOI-CMOS 像素传感器（SOIPIX）组成，将独立运行并进行观测，由嵌入 CPU 的 FPGA "Zynq "控制。我们计划在 2025 年太阳活动高峰期将 SUIM 有效载荷安装到国际空间站上。在本文中，我们将报告该项目的概况和开发状况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Atmospheric and Oceanic Physics

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