标题： 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 显示英文标题

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

摘要： 位于60至110公里高度的中间层和低热层（MLT）是所有大气层中观测数据最少的，这是由于就地观测的困难。先前的研究表明，宇宙X射线源的大气掩食是一种有效研究MLT的技术。为了连续测量MLT的大气密度，我们正在开发一款专用的X射线相机“用于观察上层大气作为任务实验的Soipix（SUIM）”。SUIM将安装在国际空间站（ISS）的暴露区域，并面向ISS的迎风方向以指向地球边缘。通过观测穿过大气层的宇宙X射线背景（CXB），我们将通过光谱学测量吸收柱密度，从而获得上层大气的密度。这款X射线相机由狭缝准直器和两个X射线SOI-CMOS像素传感器（SOIPIX）组成，并由嵌入CPU的FPGA“Zynq”控制，独立运行进行观测。我们计划在2025年太阳活动极大期期间将SUIM有效载荷安装到ISS上。本文报告了这个项目的概述及其开发现状。 显示英文摘要

摘要： 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.