谷神星表面地形遮蔽判断研究及其太阳辐射模拟  

Study of Terrain Shading Judgment on Ceres Surface and Its Solar Radiation Simulation

作　　者：刘伟[1,2] 陈楠[1,2] LIU Wei;CHEN Nan(The Academy of Digital China(Fu Jian),Fuzhou University,Fuzhou 350108,China;Key Lab for Spatial Data Mining and Information Sharing of Education Ministry,Fuzhou 350108,China)

机构地区：[1]福州大学数字中国研究院(福建),福州350108 [2]福州大学空间数据挖掘与信息共享教育部重点实验室,福州350108

出　　处：《深空探测学报（中英文）》2023年第6期677-688,共12页Journal Of Deep Space Exploration

摘　　要：综合考虑季节差异、地貌类型及研究区规模对太阳辐射模拟造成的影响,基于136.7 m分辨率的谷神星数字高程模型,使用光线追踪法对不同搜索半径样区太阳辐射进行模拟和时空分析,得到在谷神星表面实际地形遮蔽判断所需设置最小阈值搜索半径74 km的结论,并以此半径模拟谷神星表面一个太阳日内的太阳辐射。研究表明:不同时节中,南至日判断谷神星实际地表遮蔽信息所需搜索半径最大;在空间尺度上,搜索半径对不同地貌下太阳辐射影响主要与实际地形起伏及地貌形态规模有关,地表断层下太阳辐射受搜索半径影响持续、火山地貌太阳辐射受搜索半径的影响最为显著;谷神星全球太阳辐射分布呈现出明显的纬度效应,表现为由低纬度地区向高纬度地区逐渐减小。研究结果丰富和完善了谷神星表面太阳辐射理论和方法,可为未来谷神星探测提供数据和理论支撑。As solar radiation is an important source of energy received by the surface of the planets in the solar system,accurate modeling of solar radiation on the surface of Ceres is crucial for studying the thermal environment.However,the highly undulating terrain on Ceres makes determining terrain shading coefficients challenging.While the ray tracing method can accurately determine terrain shading coefficients,it is limited by the search radius.In the paper,it examines the effects of seasonal differences,landform types,and study area size on solar radiation simulation,and concludes that a minimum threshold search radius of 74 km is required to determine actual terrain shading.Using this radius,the paper simulates solar radiation over a solar day and finds that the search radius required for accurate shading information varies with time of year and landscape type.Surface faults are most consistently influenced by the search radius,while volcanic landscapes are most significantly influenced.The global solar radiation distribution of Ceres shows a gradual decrease from low to high latitudes.Results improve the theory and method of solar radiation modeling and provide data and theoretical support for future exploration of Ceres.

关 键 词：太阳辐射 搜索半径 时空格局 数字高程模型 谷神星 

分 类 号：P184[天文地球—天文学]