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MESSENGER Gamma Ray Spectrometer and Epithermal Neutron Hydrogen Data Reveal Compositional Differences Between Mercurys Hot and Cold Poles

机译:MESSENGER伽玛射线能谱仪和超热中子氢数据揭示了水银热极和冷极之间的成分差异

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摘要

The presence of hydrogen, most likely in the form of water ice, is well established in Mercury's permanently shaded polar craters. But lower concentrations that may exist away from the poles have not previously been well constrained. In this work we use data from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) Gamma‐Ray and Neutron Spectrometer to produce the first map of the absolute hydrogen abundance in Mercury's northern hemisphere. We find a mean abundance of 300150+250 ppm and a latitudinal trend that agrees with earlier results showing enhanced hydrogen contained within Mercury's radar bright craters. Additionally, we observe a middle‐ and low‐latitude variation in hydrogen abundance that is correlated most strongly with temperature 20 cm beneath Mercury's surface.
机译:汞的存在极有可能以水冰的形式存在,这在水星永久遮蔽的极地陨石坑中已得到充分证实。但是以前没有很好地限制极点附近可能存在的较低浓度。在这项工作中,我们使用来自水银表面,太空环境,地球化学和测距(MESSENGER)伽马射线和中子能谱仪的数据来绘制水星北半球绝对氢丰度的第一张图。我们发现 300 150 + 250 ppm,并且该纬度趋势与早先的结果一致,后者表明水星雷达明亮环形山中的氢含量增加。此外,我们观察到氢丰度的中低纬度变化与水星表面以下20厘米的温度最密切相关。

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