太阳总辐射照度测量研究进展OA

Deep understanding of solar radiation characteristics is of great significance for studying Earth's radiation budget.The working principles of total solar irradiance(TSI)measurement instruments,calibration methods and the latest measurement results are introduced.TSI absolute radiometers,based on the principle of photoelectrical equivalence,achieve accurate measurement by using the electrical heating power required to produce the same temperature change on the detector's sensitive surface as an equivalent measure of the solar radiation power generating an identical heating effect,combined with the known aperture area.Since cryogenic radiometers deliver the minimum measurement uncertainty in optical radiometry,the World Radiation Center conducted four comparisons between its reference TSI absolute radiometers and the cryogenic radiometer to verify their consistency.The results indicated that the TSI absolute radiometer measurements are approximately(0.34±0.18)%higher than those derived from the SI standard values.TSI measurements have now been incorporated into the SI system,with the UK,the US,and China successively establishing TSI measurement systems traceable to cryogenic radiometers.At present,global TSI observations from satellite payloads of different nations converge well.The latest composite TSI dataset now covers four complete solar cycles and has incorporated measurements from China's FY-3E satellite payload.Finally,the current status of TSI measurement in China and prospects the future development directions of relevant measurement technologies are summarized.