Fig. 1

Schematic of the multi-instrument analysis used in this study to model FUV emissions driven by electron impact on cometary neutrals. From left to right: (a) suprathermal electrons present within the coma were measured using Ion and Electron Sensor of the Rosetta Plasma Consortium (RPC/IES) (see Sect. 2.4.2). (b) Neutral gas molecules in the coma. There were four major neutral species seen at 67P: CO2, H2 O, CO, and O2 (see Sect. 2.3). (c) A collision between a suprathermal electron and a cometary molecule causes the molecule to dissociate. A neutral fragment and an excited atom are produced. (d) The excited atom de-excites, releasing a photon in the FUV. These photons were observed with the Alice FUV imaging spectrograph (see Sect. 2.2).
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