Since 1996, energetic hydrogen and helium atoms (ENAs) have been identified and their
fluxes are monitored by the High-Energy Suprathermal Time-of-Flight sensor (HSTOF) of
the Charge, Element, and Isotope Analysis System (CELIAS) on the Solar and
Heliospheric Observatory (SOHO) near the Lagrangian point L1. ENAs, neutralized via
charge transfer reactions, move along ballistic trajectories una
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