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首页> 外文期刊>Acta astronautica >High-resolution mapping of lunar polar hydrogen with a low-resource orbital mission
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High-resolution mapping of lunar polar hydrogen with a low-resource orbital mission

机译：具有低资源轨道任务的月球极氢的高分辨率制图

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Lunar permanently shaded regions (PSRs) are unique solar-system environments. Their low temperatures ( < 100 K) facilitate cold trapping of volatile materials over timescales comparable to the lifetime of the solar system. While much has been learned about these regions from orbital spacecraft, important missing information includes the spatial and depth-dependent distribution of bulk hydrogen concentrations in and around PSRs. We present two complementary mission scenarios where orbital neutron spectroscopy will provide significantly improved understanding of lunar polar bulk hydrogen concentrations. In the first mission concept, a six-month orbital mission will measure bulk hydrogen concentrations with sensitivity better than 50 ppm and a spatial resolution of order 20 km over the entire lunar South Polar region (poleward of 80 S). Spatial reconstruction analyses of the returned data will improve the final spatial resolution to better than 10 km. The presence and burial depth ( <25 cm) of subsurface deposits will be quantified with latitude-dependent sensitivities ranging from 50 to 350 ppm. The second concept envisions a few, very low altitude (similar to 5 km) flyovers of one or more PSRs to quantify the hydrogen concentrations and spatial heterogeneities with a hydrogen sensitivity less than 200 and spatial scale size of 5 km. Both concepts can be combined in a single mission where full-coverage polar measurements are made with a hydrogen spatial resolution of 20 km, and higher spatial resolution measurements are made for a few strategically selected PSRs at the end of the mission. (C) 2015 IAA. Published by Elsevier Ltd. on behalf of IAA. This is an open access article under the CC BY-NC-ND license.
机译：月球永久阴影区（PSR）是独特的太阳系环境。它们的低温（<100 K）有助于在与太阳能系统使用寿命相当的时间范围内对挥发性物质进行冷捕集。尽管已经从轨道航天器中获得了关于这些区域的很多知识，但是重要的缺失信息包括PSR内部和周围的体积氢浓度的空间和深度相关分布。我们提出了两个互补的任务场景，其中轨道中子光谱将大大提高对月球极性大体积氢浓度的了解。在第一个飞行任务概念中，为期六个月的轨道飞行任务将测量整个氢浓度，其灵敏度优于50 ppm，在整个月球南极地区（极向80 S）的空间分辨率约为20 km。对返回数据进行空间重构分析将使最终空间分辨率提高到10 km以上。地下沉积物的存在和埋藏深度（<25厘米）将根据纬度相关的灵敏度在50至350 ppm之间进行量化。第二个概念设想了一个或多个PSR的几次非常低的高架空（类似于5 km）立交桥，以量化氢浓度和空间异质性，氢敏感度小于200，空间尺度大小为5 km。可以将这两个概念组合在一个任务中，在该任务中以20 km的氢气空间分辨率进行全覆盖极性测量，并在任务结束时对一些战略选择的PSR进行更高的空间分辨率测量。 （C）2015年IAA。由Elsevier Ltd.代表IAA发布。这是CC BY-NC-ND许可下的开放获取文章。

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