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Total Solar Irradiance Monitor for Chinese FY-3A and FY-3B Satellites – Instrument Design

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Abstract

The Total Solar Irradiance Monitor (TSIM) instrument is designed to perform daily observations of total solar irradiance (TSI) in space on the Chinese FY-3A and FY-3B satellites. Three absolute radiometers are constructed for the TSIM to achieve measurements with traceability to SI with an absolute accuracy better than 550 ppm. The absolute radiometers are implemented based on the principle of electrical substitution. The design of the absolute radiometers and their electrical system, operation modes in space, and uncertainty evaluation are described. A method for calculating the electrical power in the observation and reference phases is proposed to maintain the primary cavity at a nearly constant temperature.

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Acknowledgements

This work is supported by Development Plan Project for Science and Technology of Jilin Province (No. 20130101044JC) and Basic Research Project for application of Yunnan Province (No. 2012FD050). The authors would like to thank numerous staff in Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, including Chenghu Gong, Dongjun Yang, Xin Ye, Jianbo Huang, and many others. The authors are grateful to Bingxi Yu, former project leader of the TSIM, for his great contributions and precious advice concerning the TSIM. The authors thank the referee for generous help and good comments.

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Correspondence to Hongrui Wang.

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Fang, W., Wang, H., Li, H. et al. Total Solar Irradiance Monitor for Chinese FY-3A and FY-3B Satellites – Instrument Design. Sol Phys 289, 4711–4726 (2014). https://doi.org/10.1007/s11207-014-0595-6

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  • DOI: https://doi.org/10.1007/s11207-014-0595-6

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