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Direct Measurements of Energetic Neutral Hydrogen in the Interplanetary Medium

Fedorov, A.; Barabash, S.; Lundin, R. +16 more

We present an analysis of hydrogen energetic neutral atoms (ENAs) measured by the ASPERA-3 instrument on board Mars Express. We focus on ENAs that have no Martian origin. The energy spectra of these ENAs are all very similar and can be fitted well by a two-component power law. The fluxes, integrated from 0.2 to 10 keV, vary between 5×10³