Solar Observation with the Fourier Transform Spectrometer.II.Preliminary Results of Solar Spectrum near the CO 4.66μm and Mg I 12.32μm  

作　　者：Xianyong Bai Zhiwei Feng Zhiyong Zhang Yuanyong Deng Xiaoming Zhu Kaifan Ji Song Feng Xiao Yang Yongliang Song 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China [3]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China [4]Faculty of Information Engineering and Automation/Yunnan Key Laboratory of Computer Technology Application,Kunming University of Science and Technology,Kunming 650500,China

出　　处：《Research in Astronomy and Astrophysics》2023年第12期128-137,共10页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China(2021YFA1600500);the Youth Innovation Promotion Association CAS(2023061);the National Natural Science Foundation of China(NSFC,Grant Nos.12003051,11427901)。

摘　　要：An infrared solar spectrum observed by ground-based telescopes is seriously affected by the background radiation both from the telescope and sky,relative to the visible wavelengths.Its accuracy is also influenced by the spectral resolution of the Fourier transform spectrometer.In the paper,we developed a CO_(2)gas cell and installed it in the sample compartment to calibrate the spectral resolution of the Bruker IFS-125HR at infrared wavelengths.The measured spectral resolution is 0.00342±0.00086 cm^(-1)and 0.0059±0.00024 cm^(-1)at the wavenumbers of798 cm^(-1)and 2136 cm^(-1),respectively.We also updated a fully reflective sunlight feeding system to observe the solar spectrum near CO 4.66μm and Mg I 12.32μm.By quickly pointing the sunlight feeding system about1 degree away from the solar disk center,we are able to measure the background radiation from the telescope and the sky at Huairou Solar Observing Station.After removing the background radiation,our observed solar spectrum at CO 4.66μm is consistent with that from the National Solar Observatory.The Mg I 12.32μm working line selected by the Accurate Infrared Magnetic Field Measurements of the Sun(AIMS)project is also identified.Our method is helpful not only for the spectral resolution calibration and background radiation correction of AIMS but also for other infrared astronomical telescopes.

关 键 词：SUN infrared-methods observational-instrumentation INTERFEROMETERS 

分 类 号：P182.21[天文地球—天文学]