Lunar absolute reflectance as observed by Chang'E-1 Imaging Interferometer  

作　　者：ZHANG Jiang LING ZongCheng LIU JianZhong WU ZhongChen LI Bo NI YuHeng 

机构地区：[1]School of Physics, Shandong University [2]Institute of Space Sciences, Shandong University [3]Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science,Shandong University [4]Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第8期102-107,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11003012,41373068,41473065 and U1231103)

摘　　要：Lunar absolute reflectance, which describes the fraction of solar radiation reflected by the Moon, is fundamental for the Chang'E-1 Imaging Interferometer(IIM) to map lunar mineralogical and elemental distributions. Recent observations made by the Spectral Irradiance Monitor(SIM) onboard the Solar Radiation and Climate Experiment(SORCE) spacecraft indicate that temporal variation in the solar radiation might have non-negligible influence on reflectance calculation, and the SIM measurements are different from the two previously used solar irradiances, i.e., ATLAS3 and Newkur. To provide reliable science results, we examined solar irradiance variability with the SIM daily observations, derived lunar absolute reflectances from the IIM 2A radiance with the SIM, ATLAS3 and Newkur data, and compared them with the Chandrayaan-1 Moon Mineralogy Mapper(M3), the Robotic Lunar Observatory(ROLO) and the Kaguya Multispectral Imager(MI) results. The temporal variability of the SIM solar irradiance is 0.25%–1.1% in the IIM spectral range, and less than 0.2% during the IIM observations. Nevertheless, the differences between the SIM measurements and the ATLAS3 and Newkur data can respectively rise up to 8% and 5% at particular IIM bands, resulting in discrepancy between which might affect compositional mapping. The IIM absolute reflectance we derived for the Moon using the SIM data, except for the last two bands, is consistent with the ROLO and the MI observations, although it is lower.Lunar absolute reflectance, which describes the fraction of solar radiation reflected by the Moon, is fundamental for the Chang＇E-1 Imaging Interferometer （IIM） to map lunar mineralogical and elemental distributions. Recent observations made by the Spectral Irradiance Monitor （SIM） onboard the Solar Radiation and Climate Experiment （SORCE） spacecraft indicate that temporal variation in the solar radiation might have non-negligible influence on reflectance calculation, and the SIM measure- ments are different from the two previously used solar irradiances, i.e., ATLAS3 and Newkur. To provide reliable science re- sults, we examined solar irradiance variability with the SIM daily observations, derived lunar absolute reflectances from the IIM 2A radiance with the SIM, ATLAS3 and Newkur data, and compared them with the Chandrayaan-1 Moon Mineralogy Mapper （M3）, the Robotic Lunar Observatory （ROLO） and the Kaguya Multispectral Imager （MI） results. The temporal varia- bility of the SIM solar irradiance is 0.25%-1.1% in the IIM spectral range, and less than 0.2% during the IIM observations. Nevertheless, the differences between the SIM measurements and the ATLAS3 and Newkur data can respectively rise up to 8% and 5% at particular IIM bands, resulting in discrepancy between which might affect compositional mapping. The IIM ab- solute reflectance we derived for the Moon using the SIM data, except for the last two bands, is consistent with the ROLO and the MI observations, although it is lower.

关 键 词：Chang＇E-1 Imaging Interferometer （IIM） absolute reflectance solar irradiance 

分 类 号：P184[天文地球—天文学] TP732.2[自动化与计算机技术—检测技术与自动化装置]