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New suprathermal proton population around the Moon: Observation by SARA on Chandrayaan-1

Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +4 more

We report a new population of suprathermal H⁺ (∼1.5-3 times the solar wind energy) around the Moon observed by Solar Wind Monitor (SWIM)/Sub-keV Atom Reflecting Analyzer (SARA) on Chandrayaan-1. These ions have large initial velocity (>100 km s^-1) and are observed on the dayside, near the terminator, and in the near-wake r…