Enhanced hydrogen at the lunar poles: New insights from the detection of epithermal and fast neutron signatures
Enhanced hydrogen at the lunar poles: New insights from the detection of epithermal and fast neutron signatures
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月球两极的增强氢：来自超热中子和快中子特征检测的新见解
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发表时间：
2012
期刊：
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通讯作者：
D. Lawrence
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作者：
Richard S. Miller;G. Nerurkar;D. Lawrence
[1] 月球勘探者 (LP) 和月球勘测轨道飞行器 (LRO) 轨道中子光谱数据集代表了独特的综合多任务月球资源。严格的统计方法已用于（重新）分析这两项任务的中子数据，以提供有关各个探测器数据集之间关系的新细节，以及对月球两极增强的氢沉积物的新评估。使用多任务超热中子数据集，我们发现水冰广泛分布在两极，但显示出依赖于地形特征的证据。从超热中子数据得出，每极的足迹平均水当量氢 (WEH) 丰度为 106 ± 11 ppm，北极和南极的最大值分别为 131 和 112 ppm。我们还报告了首次明确检测到与增强氢假说一致的快中子特征。这些数据表明高度局部化的分布，与沙克尔顿陨石坑一致，对应于足迹平均WEH丰度为194±11。如果限制在这个陨石坑内，这个丰度会产生~0.7%WEH的局部沉积。分析方法的细节以及显示月球两极有趣的增强氢沉积的空间分布图一起呈现。
[1] The Lunar Prospector (LP) and Lunar Reconnaissance Orbiter (LRO) orbital neutron spectroscopy data sets represent a unique comprehensive multimission lunar resource. A rigorous statistical approach has been used to (re)analyze neutron data from both missions to provide new details regarding the relationships between the individual detector data sets, as well as a new evaluation of enhanced hydrogen deposits at the lunar poles. Using the multimission epithermal neutron data set, we find water ice distributed broadly across the poles, but showing evidence for a dependence on topographical features. A footprint averaged water equivalent hydrogen (WEH) abundance of 106 ± 11 ppm at each pole, with maxima of 131 and 112 ppm at the north and south poles, respectively, is derived from the epithermal neutron data. We also report the first definitive detection of a fast neutron signature consistent with an enhanced hydrogen hypothesis. These data suggest a highly localized distribution, consistent with Shackleton Crater, corresponding to a footprint averaged WEH abundance of 194 ± 11. If confined to this crater, this abundance yields a localized deposit of ∼0.7% WEH. Details of the analysis approach are presented along with spatial distribution maps showing the intriguing enhanced hydrogen deposits at the lunar poles.