Illustration of particle motion at 67P/Churyumov-Gerasimenko, showing outgassing of neutral water molecules, the beginning of the H2O+ trajectories, and deflection of solar wind ions. During the observations reported in this paper the position of the spacecraft was 28 km from the comet, which was 2.5 AU from the Sun. Schematic of solar wind deflection adapted from Behar et al. (2016a). Photo of nucleus and spacecraft: ESA – European Space Agency.
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