风云三号C星太阳总辐照度观测结果分析  

Analysis of total solar irradiance observed by FY-3C Solar Irradiance Monitor-Ⅱ

作　　者：齐瑾[1] 张鹏[1] 邱红[1] 方伟[2] 叶新[2] 王玉鹏[2] 

机构地区：[1]国家卫星气象中心,北京100081 [2]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《科学通报》2015年第25期2447-2454,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(41227003,41474161)资助

摘　　要：第二代极轨气象卫星风云三号C星(FY-3C)携带的太阳辐射监测仪(Solar Irradiance Monitor,SIM)是FY-3A/B星上同类载荷的改进型,称为太阳辐射监测仪II型(SIM-II).针对SIM-II在轨观测获取的日地平均距离处太阳总辐照度数据,通过与国外同类产品以及太阳黑子数据进行对比分析,检验SIM-II太阳总辐照度产品精度,评估仪器在轨观测能力.比对结果显示,SIM-II太阳总辐照度数据与国外同类产品相比在变化趋势上具有很好的一致性,与美国NASA发射的太阳辐射和气候变化试验卫星(Solar Radiation and Climate Experiment,SORCE)/总辐照度监测仪(Total Irradiance Monitor,TIM)产品的相对均方根偏差约为87×10?6,与比利时皇家气象研究所(RMIB)基于多个星基太阳总辐射观测数据处理得到的太阳总辐照度合成数据(简称RMIB数据)的相对均方根偏差约为140×10?6.SIM-II太阳总辐照度与太阳黑子数的相关性分析结果显示二者在极值分布上具有较好的对应;针对2014年10月太阳超强活动过程的监测结果显示,SIM-II和TIM观测的太阳总辐照度变化与太阳黑子面积变化相关,当太阳黑子面积增大2470时,SIM-II监测到的太阳总辐照度变化为?2.94 W/m2,TIM监测结果为?2.98 W/m2,说明SIM-II的观测结果能够定量反映由太阳活动导致的辐射能量变化.研究表明,FY-3C星太阳总辐照度数据已达到国际同类产品的观测精度,可以用于太阳活动及气候变化监测等相关研究.Solar Irradiance Monitor-Ⅱ （SIM-Ⅱ） onboard FengYun-3C （FY-3C）, the third satellite of the second generation of Chinese meteorological polar orbit series, is a successive instrument from FY-3A/B SIMs with improved capabilities of solar tracking and temperature controlling. SIM-Ⅱ is aimed to observe incoming solar energy over 0.2-50 μm band at top of atmosphere and convert it to total solar irradiance （TSI） at the average sun-earth distance. The instrument has a measuring requirement of 0.1% absolute accuracy and long-term relative precision of 0.02% during its 4-year design lifetime. The TSI observed by SIM-Ⅱ is analyzed and validated by comparing with SORCE/TIM and the composite time series from Royal Meteorological Institute of Belgium （RMIB） daily mean products. It shows that there is a good consistency on variation trend in TSI among SIM-Ⅱ, TIM and RMIB, from March 5, 2014 to September 22, 2014. The quantitative comparison shows SIM-Ⅱ daily TSI product has an 87×10^-6 rms relative error compared with SORCE/TIM data and 140x10-6 rms relative error with RMIB composite data. The sunspot data including sunspot number and area is also analyzed with SIM-Ⅱ TSI product. The sunspot number is negative correlation with SIM-Ⅱ TSI daily product at solar activities. The TSI variation at the strongest solar activity during the October 2014 shows a good correlation with the sunspot area data. When sunspot area is increased by 2470, the variation in TSI from SIM-Ⅱ is about -2.94 and -2.98 W/m^2 for TIM, which is very close to each other. It can be concluded that the SIM-Ⅱ TSI observations can quantitatively reflect the variations of the solar emission during solar activities. These studies show that FY-3C TSI product had achieved the same accuracy as those of SORCE/TIM and RMIB data, and can be used in the researches of solar activities and climate changes.

关 键 词：风云三号C星 太阳辐射监测仪Ⅱ型 太阳总辐照度 太阳黑子 交叉比对 

分 类 号：P412.27[天文地球—大气科学及气象学]