| Title |
A Study on the Lunar Ground Temperature Profile for Investigation of Possible Condition of the Ice Layer Existence in Sub-surface of the Moon |
| Authors |
고규현(Go, Gyu-Hyun) ; 이장근(Lee, Jangguen) ; 신휴성(Shin, Hyu-Soung) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.6.0801 |
| Keywords |
달극지탐사;영구음영지역;열전달해석;얼음층;지반온도프로파일 Lunar pole exploration;Permanently shadowed regions;Heat transfer analysis;Ice-layers;Ground temperature profile |
| Abstract |
NASA's lunar polar exploration mission in 2009 confirmed the presence of ice-layer in the permanently shadowed regions (PSR) of the moon. Since then, studies have been actively conducted to evaluate the ground characteristics for exploring the ice-layer in the polar regions of the Moon. In this study, transient heat transfer analysis for the lunar ground was conducted to predict the ground's temperature that varies with the time and location. As a result of the numerical analysis, it was confirmed that the temperature under the lunar ground converged to below the ice sublimation reference temperature (≒112 K) at above 86° latitude. This model enabled us to identify the regions where there is a high possibility of ice being buried. Besides, we found that the ice-layer in the shallow region, where the temperature deviation is significant, makes ground temperature distribution heterogeneous. Lastly, this study suggested the maximum allowable frictional heat of a drill bit that can preserve the phase of buried ice. |