基于微型射频和占卜仪观测的月球表面介电常数的温度依赖性

Chenhao Sun, Hideaki Miyamoto, Makito Kobayashi
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引用次数: 0

摘要

雷达观测是根据介电常数了解地下结构的有效方法,其控制因素包括化学成分、堆积密度和水/冰含量。最近,实验室测量结果表明,月球碎屑模拟物的介电常数还取决于温度,而这一点从未通过遥感数据进行过评估。在这项研究中,我们通过微型射频(Mini-RF)数据估算了北极地区一个月球坑底在两个不同的局部时间(即不同的表面温度)的介电常数。我们利用反演法计算了介电常数,并从占卜者月球辐射计实验(Diviner)数据中获得了测地表面温度。估计介电常数值的直方图在两个本地时间之间是不同的。这可以解释为介电常数与温度有关,同时还需要进一步评估地形对入射角和小表面粗糙度的影响。尽管如此,我们的结果表明,在解释对月球和其他表面温差较大的天体的 S 波段雷达观测结果时,应考虑介电常数的温度依赖性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature Dependence of the Dielectric Constant on the Lunar Surface Based on Mini-RF and Diviner Observations
Radar observation is an effective way to understand subsurface structures in terms of the dielectric constant, whose controlling factors include chemical composition, packing density, and water/ice content. Recently, laboratory measurements have shown that the dielectric constant of lunar regolith simulants also depends on the temperature, which has never been evaluated from remote sensing data. In this study, we estimated the dielectric constant from the Miniature Radio Frequency (Mini-RF) data on a lunar crater floor in the north polar region at two different local times (i.e., different surface temperatures). We calculated the dielectric constant using the inversion method and obtained the bolometric surface temperature from the Diviner Lunar Radiometer Experiment (Diviner) data. The histograms of the estimated dielectric constant values are different between the two local times. This could be interpreted as a result of the temperature dependence of the dielectric constant, while further evaluation of the influence of topography on the incidence angle and small surface roughness is needed. Nevertheless, our result suggests that the temperature dependence of the dielectric constant should be considered when interpreting S-band radar observations of the Moon and other celestial bodies with large surface temperature differences.
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