Solar X-ray and EUV imager on board the FY-3E satellite
Bo Chen, Xiaoxin Zhang, Lingping He, Kefei Song, Shijie Liu, Guang-Xing Ding, Jinping Dun, Jiawei Li, Zhaohui Li, Quanfeng Guo, Haifeng Wang, Xiaodong Wang, Yunqi Wang, Hongji Zhang, Guang Zhang, Zhenwei Han, Shuang Dai, Pei-Jie Zhang, Liang Sun, Yang Liu, Peng Wang, Kun Wu, Chen Tao, Shilei Mao, Gui Mei, Liang Yang, Liheng Chen, Chunyang Han, Bin Huang, Yang Liu, Shuai Ren, Peng Zhou, Ze-Xi Wei, Xiaoxue Zhang, Y. Zhang, Xin Zheng, Yang Wang, Ya Chen, Jingjiang Xie, Fei He, Qiao Song, Weiguo Zong, Xiuqing Hu, Peng Zhang, Jingsong Wang, Zhongdong Yang
Abstract
The solar X-ray and Extreme Ultraviolet Imager (X-EUVI), developed by the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CIOMP), is the first space-based solar X-ray and Extreme ultraviolet (EUV) imager of China loaded on the Fengyun-3E (FY-3E) satellite supported by the China Meteorological Administration (CMA) for solar observation. Since started work on July 11, 2021, X-EUVI has obtained many solar images. The instrument employs an innovative dual-band design to monitor a much larger temperature range on the Sun, which covers 0.6-8.0 nm in the X-ray region with six channels and 19.5 nm in the EUV region. X-EUVI has a field of view of 42', an angular resolution of 2.5″ per pixel in the EUV band and an angular resolution of 4.1″ per pixel in the X-ray band. The instrument also includes an X-ray and EUV irradiance sensor (X-EUVS) with the same bands as its imaging optics, which measures the solar irradiance and regularly calibrates the solar images. The radiometric calibration of X-EUVS on the ground has been completed, with a calibration accuracy of 12%. X-EUVI is loaded on the FY-3E satellite and rotates relative to the Sun at a uniform rate. Flat-field calibration is conducted by utilizing successive rotation solar images. The agreement between preliminarily processed X-EUVI images and SDO/AIA and Hinode/XRT images indicates that X-EUVI and the data processing algorithm operate properly and that the data from X-EUVI can be applied to the space weather forecast system of CMA and scientific investigations on solar activity.