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Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts
Stubbs, T. J.; Elphic, R. C.; Benna, M. +2 more
Analyses of samples from the Apollo missions suggest that the Moon formed devoid of native water. However, recent observations by Cassini, Deep Impact, Lunar Prospector and Chandrayaan-1 indicate the existence of an active water cycle on the Moon. Here we report observations of this water cycle, specifically detections of near-surface water releas…
Solar Wind Implantation Into the Lunar Regolith: Monte Carlo Simulations of H Retention in a Surface With Defects and the H2 Exosphere
Farrell, W. M.; Killen, R. M.; Tucker, O. J. +1 more
The solar wind implants protons into the top 20-30 nm of lunar regolith grains, and the implanted hydrogen will diffuse out of the regolith but also interact with oxygen in the regolith oxides. We apply a statistical approach to estimate the diffusion of hydrogen in the regolith hindered by forming temporary bonds with regolith oxygen atoms. A Mon…
Global mapping of lunar refractory elements: multivariate regression vs. machine learning
Wöhler, C.; Grumpe, A.; Bhatt, M. +2 more
Context. The quantitative estimation of elemental concentrations at the spatial resolution of hyperspectral near-infrared (NIR) images of the lunar surface is an important tool for understanding the processes relevant for the origin and evolution of the Moon.
Aims: We aim to map the abundances of the elements Fe, Ca, and Mg at a typical accur…
Study of morphology and degradation of lunar craters using Chandrayaan-1 data
Srivastava, Pradeep; Jain, Vikrant; Khanna, Nitin +2 more
Impact craters are essential and dominant features of the lunar surface. Under the presence of a very thin atmosphere, the degradation of the lunar craters takes place possibly due to gravity, slope processes, or solar wind weathering. Hence, these craters act as tools to understand the properties and processes of the lunar surface. Our analysis i…
Improved Chandrayaan-1 M3 data: A northwest portion of the Aristarchus Plateau and contiguous maria
Shkuratov, Yu.; Surkov, Ye.; Ivanov, M. +5 more
We provide and test a method to obtain significant improvement of available Chandrayaan-1 M3 data. The advance is achieved using the Gaussian λ-convolution of spectra and Fourier filtration of images. The main result is imagery of the reflectance across different wavelengths as well as parameters of 1 µm and 2 µm absorption …
Automatic endmember bundle unmixing methodology for lunar regional area mineral mapping
Yin, Jihao; Huang, Chenyu; Luo, Xiaoyan +1 more
The mineral distribution on lunar surface can contribute to studying lunar evolution, while abundance quantification is still challenging. Unmixing on spectral reflectance data is an effective way for mineral resource explanation, especially in hardly accessible area. In regional area unmixing, some existing unmixing models mainly rely on spectral…
Detection of an excessively strong 3-µm absorption near the lunar highland crater Dufay
Wöhler, C.; Grumpe, A.; Bhatt, M. +3 more
Using the near-infrared spectral reflectance data of the Chandrayaan-1 Moon Mineralogy Mapper (M3) instrument, we report an unusually bright structure of 30 × 60 km2 on the lunar equatorial farside near crater Dufay. At this location, the 3-µm absorption band feature, which is commonly ascribed to hydroxyl (OH) and/or w…