Distributed Model And Numerical Calculation Of Lunar Surface Physical Temperature

Detecting the lunar regolith depth is one of the most significant aims of lunar exploration. Exact lunar surface microwave transfer model is fundamental in retrieving the lunar regolith depth. The critical factor in this model is the distribution of lunar surface physical temperature. The lunar surface temperature is a function of lunar latitude, longitude, depth and time.Firstly, the basic theory of thermal conduction is introduced. Considering the former researchers'kinds of physical model of lunar surface temperature, this paper proposed an improved transient model to simulate the temperature. The parameters such as solar irradiance, earthshine and heat flow in this model are accurately deduced and calculated, meanwhile, the approaches and processes in numerical calculation of lunar surface temperature are elaborated. The errors caused by thermal conductivity, density and heat capacity in calculating temperature are also discussed. Compared with Apollo landing sites'measurement and previous studies, it proves that this model could accurately calculate the lunar surface temperature.Moreover, shading caused by the lunar surface topography would induce a obvious change of temperature, so this paper suggests two kinds of approaches to revise the temperature. Finally, considering the measured laser altimeter data, raw calculation is accomplished. The results show that topography would cause a significant change in calculating the lunar surface temperature.