论文标题
月球南极 - 艾特肯盆地的雷果石的介电特性和地层：来自月球穿透雷达的观测
Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar
论文作者
论文摘要
我们研究了通过chang'e-4（CE-4）任务的月球穿透性雷达（LPR）获得的数据，以研究月球远端的月球岩石的介电特性和地层。从2019年1月到2020年9月收集的数据进行了处理，以产生540 m的雷达法。雷达信号的行进速度和雷果石的介电性是从雷克拉姆中的双曲线推导的。当CE-4 LPR检测到不同的平面反射器时，我们根据雷达方程的最大穿透深度评估了介电损失。将衍生的介电特性与Apollo样品和Chang'e-2微波辐射仪观测值进行比较。结果表明，着陆点的岩石石的介电常数为2.64-3.85，切线切线为0.0032-0.0044，这表明本地岩石石的质量比在chang'e-3着陆点上发现的高粒度，低损坏的材料组成。风化材料的总厚度为40 m，有几层岩石层，并在重建的地下结构中被掩埋的杂志。这些层清楚地记录了来自相邻地区的一系列影响事件。我们建议顶层主要由140公里外的大型火山口射出。相比之下，其他较薄的层的材料来源来自附近的较小的陨石坑。
We examine data obtained by the Lunar Penetrating Radar (LPR) onboard the Chang'E-4 (CE-4) mission to study the dielectric properties and stratigraphy of lunar regolith on the far side of the Moon. The data collected from January 2019 to September 2020 were processed to generate a 540 m radargram. The travel velocity of the radar signal and the permittivity of the regolith were deduced from hyperbolas in the radargram. As CE-4 LPR detected distinct planar reflectors, we evaluated the dielectric loss from the maximum penetration depth based on the radar equation. The derived dielectric properties are compared with the measurements of Apollo samples and Chang'E-2 microwave radiometer observations. The results suggest that regolith at the landing site has a permittivity of 2.64-3.85 and a loss tangent of 0.0032-0.0044, indicating that the local regolith is composed of a fine-grained, low-loss material that is much more homogeneous than that found at the Chang'E-3 landing site. The total thickness of weathered material is 40 m, with several regolith layers and a buried craternidentified in the reconstructed subsurface structure. These layers clearly record a series of impact events from the adjacent regions. We suggest that the top layer is primarily made up of the ejecta from a large crater 140 km away. In contrast, the material source of other thinner layers comes from nearby smaller craters.
