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181.
Feng Zhang Yong-Liao Zou Yong-Chun Zheng Xiao-Hui Fu Yong-Chao Zhu 《天文和天体物理学研究(英文版)》2014,(1):113-128
The process of accurately defining and outlining mare basalt units is necessary for constraining the stratigraphy and ages of basalt units,which are used to determine the duration and the flux of lunar volcanism.We use a combination of Clementine’s five-band ultraviolet/visible data and TiO2and FeO abundance distribution maps to define homogenous mare basalt units and characterize their compositional variations(with maturity)in the Aristarchus region.With 20 groups of distinct mare basaltic soils identified using the method in this paper,six additional spectrally defined areas and five basaltic units are constructed,and their mineralogic quantization values provide new constraints on their temporal and spatial evolution.Our results indicate that the Aristarchus region has diverse basalt units and a complex history of volcanic evolution.We also demonstrate that the techniques,from which spectrally distinct mare basalts can be mapped,performed well in this study and can be confidently expanded to other mare regions of the Moon. 相似文献
182.
丽江高美古的天文观测条件 总被引：6，自引：0，他引：6
综述对丽江高美古的视宁度、天光亮度、消光系数进行观测的原理、仪器、观测方法和结果．结果表明,高美古是我国南方的优良光学天文台址,视宁度达到世界优良台址的水平 相似文献