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基于LOLA数据的冯·卡门撞击坑太阳辐射研究
张吉栋1,2,3, 孟治国1,2,3, 朱蕴哲1, 曾昭发1, 平劲松3
1.吉林大学 地球探测科学与技术学院, 长春 130026;2.中国科学院 遥感与数字地球研究所遥感科学国家重点实验室, 北京 100101;3.中国科学院 国家天文台月球与深空探测重点实验室, 北京 100012
摘要:
冯·卡门(Von Kármán)撞击坑是“嫦娥4号”的候选着陆区之一。基于LOLA高程数据,对当前的月球光照模型做出改进,建立了月表太阳辐射模型,对冯·卡门地区2018年太阳辐射进行了数值模拟分析。结果表明:地形对太阳辐射的影响很大,撞击坑的南部坑壁、中央峰北部以及内部小撞击坑南部坑壁接收的太阳辐射能较多,坑底平原大部分地区接收的太阳辐射能在(0.9~1)×1010 J/m2之间;不考虑月面坡度时,太阳辐射能量主要受纬度的影响,计算区域的变化范围为(0.87~1.01)×1010 J/m2。结合月表坡度和光照条件提出了两个候选着陆区(S1区和S2区):S1区位于坑底南部平原,地势更平缓,日出更早,光照时间更长;S2区位于中央峰西北侧,接收的太阳辐射能量更多。两区全年平均接收的太阳辐射能分别为9.31×109 J/m2和9.65×109 J/m2,7月份光照时间最长,更适宜着陆。
关键词:  太阳辐射;月球光照模型;冯·卡门撞击坑;着陆区
DOI:10.15982/j.issn.2095-7777.2018.01.002
分类号:P184
基金项目:国家自然科学基金项目(41371332,41590851);遥感科学国家重点实验室开放基金资助(OFSLRSS201706)
Research on Solar Radiation of Von Kármán Crater Using LOLA Data
ZHANG Jidong1,2,3, MENG Zhiguo1,2,3, ZHU Yunzhe1, ZENG Zhaofa1, PING Jinsong3
1.College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China;2.State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China;3.Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, China
Abstract:
The Von Kármán crater is one of the candidate landing sites of Chinese CE-4 mission. An effective solar radiation model was established through the improvement of the lunar illumination model based on LOLA data. Then the solar radiation condition of Von Kármán crater in 2018 was numerically simulated and analyzed. The results are as followings. Firstly,the topography strongly impacts the solar radiation,that is,there is more solar radiation in the south crater wall,the north side of the central peak and the south wall of the small craters. What's more,the solar radiation energy received by the most areas of bottom plain is about (0.9~1)×1010 J/m2. Also,the solar radiation is more easily affected by latitude without considering the surface slope,the range of which is between 0.87 to 1.01×1010 J/m2 from the north end to the south. Thereafter,two candidate landing areas,named regions S1 and S2,were proposed based on surface slope and illumination conditions. The Region S1 is located in the bottom of the southern plain with more flat terrain,sunrise earlier and longer illumination time;while the Region S2 is located in the northwest side of the central peak with more solar radiation energy. The annual average solar radiation energy of the two regions are 9.31×109 J/m2 and 9.65×109 J/m2,respectively. The longest illumination time is in July,which is more suitable for landing.
Key words:  solar radiation;lunar illumination model;Von Kármán crater;landing areas