Abstract : We present observations of the coma of comet 67P/Churyumov-Gerasimenko made by the Alice far- ultraviolet spectrograph on Rosetta between January and mid-April 2015. Atomic emissions of hydrogen, oxygen, and carbon are interpreted in terms of disso- ciative electron excitation of H2O, CO2, CO, and O2, whose relative abundances can be derived from the spectra and which are found to be both spatially and temporally variable.
P. D. Feldman, Michael F. A'Hearn, Jean-Loup Bertaux, L. M. Feaga, J. Wm. Parker, et al.. Far-ultraviolet spectroscopy from inside the coma of comet 67P/Churyumov-Gerasimenko with Alice on Rosetta. European Planetary Science Congress 2015, Sep 2015, Nantes, France. pp.EPSC2015-727. ⟨insu-01213925⟩
