Research on the On-orbit Background of the Hard X-Ray Imager Onboard ASO-S  

作　　者：Wei Liu Deng-Yi Chen Xian-Kai Jiang Jian Wu Zhe Zhang Yi-Ming Hu Yang Su Wei Chen Tao Ma 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

出　　处：《Research in Astronomy and Astrophysics》2022年第9期116-131,共16页天文和天体物理学研究（英文版）

基　　金：supported by the Strategic Priority Research Program on Space Science,Chinese Academy of Sciences (No.XDA 15 320 104);National Natural Science Foundation of China (NSFC, Grant Nos. 11973097, 12173100 and 12022302);the Youth Innovation Promotion Association CAS (Nos.2021317 and Y2021087)。

摘　　要：The space environment background of various particle fluxes of the Hard X-ray Imager(HXI), one of the payloads of the Advanced Space-based Solar Observatory(ASO-S) spacecraft, is investigated and presented. Different approaches are used to obtain the input information on various space environment particles(protons, alpha particles, electrons, positrons, neutrons, and photons). Some special regions(SAA and radiation belt) are also taken into account. The findings indicate that electrons are the primary background source in the radiation belt. Due to the large background flux generated by electrons, HXI cannot effectively observe solar flares in the radiation belt.Outside the radiation belt, primary protons and albedo photons are the main sources of background at low and high magnetic latitudes respectively. The statistical analysis of the flare and background spectra shows that the errors of the flare energy spectrum observation are mainly concentrated in the high energy band, and the detector still has a certain spectrum observation capability for flares of C-class and below in the low energy band of the non-radiation belt. The imaging observation of flares of C-class and below is significantly affected by the accuracy of background subtraction. The energy band with the best signal-to-noise ratio is from 10 to 50 ke V, which can be used to monitor the formation and class of flares.

关 键 词：instrumentation:detectors Sun:X-rays GAMMA-RAYS X-rays:diffuse background (cosmology:)cosmic background radiation 

分 类 号：V447.1[航空宇航科学与技术—飞行器设计] P182.2[天文地球—天文学]