The Solar Upper Transition Region Imager (SUTRI) onboard the Space Advanced Technology demonstration satellite (SATech-01), which was launched to a sun-synchronous orbit at a height of 500 km in July 2022, aims to test the on-orbit performance of our newly developed Sc-Si multi-layer reflecting mirror and the 2kx2k EUV CMOS imaging camera and to take full-disk solar images at the Ne VII 46.5 nm spectral line with a filter width of 3 nm. SUTRI employs a Ritchey-Chretien optical system with an aperture of 18 cm. The on-orbit observations show that SUTRI images have a field of view of 41.6'x41.6' and a moderate spatial resolution of 8" without an image stabilization system. The normal cadence of SUTRI images is 30 s and the solar observation time is about 16 hours each day because the earth eclipse time accounts for about 1/3 of SATech-01's orbit period. Approximately 15 GB data is acquired each day and made available online after processing. SUTRI images are valuable as the Ne VII 46.5 nm line is formed at a temperature regime of 0.5 MK in the solar atmosphere, which has rarely been sampled by existing solar imagers. SUTRI observations will establish connections between structures in the lower solar atmosphere and corona, and advance our understanding of various types of solar activity such as flares, filament eruptions, coronal jets and coronal mass ejections.
@article{arxiv.2303.03669,
title = {The Solar Upper Transition Region Imager (SUTRI) onboard the SATech-01 satellite},
author = {Xianyong Bai and Hui Tian and Yuanyong Deng and Zhanshan Wang and Jianfeng Yang and Xiaofeng Zhang and Yonghe Zhang and Runze Qi and Nange Wang and Yang Gao and Jun Yu and Chunling He and Zhengxiang Shen and Lun Shen and Song Guo and Zhenyong Hou and Kaifan Ji and Xingzi Bi and Wei Duan and Xiao Yang and Jiaben Lin and Ziyao Hu and Qian Song and Zihao Yang and Yajie Chen and Weidong Qiao and Wei Ge and Fu Li and Lei Jin and Jiawei He and Xiaobo Chen and Xiaocheng Zhu and Junwang He and Qi Shi and Liu Liu and Jinsong Li and Dongxiao Xu and Rui Liu and Taijie Li and Zhenggong Feng and Yamin Wang and Chengcheng Fan and Shuo Liu and Sifan Guo and Zheng Sun and Yuchuan Wu and Haiyu Li and Qi Yang and Yuyang Ye and Weichen Gu and Jiali Wu and Zhe Zhang and Yue Yu and Zeyi Ye and Pengfeng Sheng and Yifan Wang and Wenbin Li and Qiushi Huang and Zhong Zhang},
journal= {arXiv preprint arXiv:2303.03669},
year = {2023}
}