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Empirical energy spectra of neutralized solar wind protons from the lunar regolith

Barabash, S.; Holmström, M.; Futaana, Y. +7 more

We present an empirical model of the energy spectra for hydrogen energetic neutral atoms (ENA) backscattered from the lunar surface based on Chandrayaan-1 Energetic Neutral Atom (CENA) observations. The observed energy spectra of the backscattered ENAs are well reproduced by Maxwell-Boltzmann distribution functions. The backscatter fraction is con…