Initial In-flight Results: The Total Solar Irradiance Monitor on the FY-3C Satellite,an Instrument with a Pointing System |
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| Authors: | Hongrui Wang Jin Qi Huiduan Li Wei Fang |
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| Institution: | 1.Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,China;2.Physikalisch-Meteorologisches Observatorium Davos,World Radiation Center,Davos Dorf,Switzerland;3.National Satellite Meteorological Center,Beijing,China;4.Chuxiong Normal University,Chuxiong,China |
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| Abstract: | The total solar irradiance (TSI) has been recorded daily since October 2013 by the Total Solar Irradiance Monitor (TSIM) onboard the FY-3C satellite, which is mainly designed for Earth observation. The TSIM has a pointing system to perform solar tracking using a sun sensor. The TSI is measured by two electrical substitution radiometers with traceability to the World Radiation Reference. The TSI value measured with the TSIM on 2 October 2013 is \(1364.88~\mbox{W}\,\mbox{m}^{-2}\) with an uncertainty of \(1.08~\mbox{W}\,\mbox{m}^{-2}\). Short-term TSI variations recorded with the TSIM show good agreement with SOHO/VIRGO and SORCE/TIM. The data quality and accuracy of FY-3C/TSIM are much better than its predecessors on the FY-3A and FY-3B satellites, which operated in a scanning mode. |
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