UV aurora brightness constrains electron-impact ionization of Ganymede's O2 to 1.3-7.6×10^26 s^{-1} globally, dominating photoionization and driving 0.5-11 kg/s O2+ outflow.
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Constraining Electron-Impact Ionization of O$_2$ Through UV Aurora Observations at Ganymede
UV aurora brightness constrains electron-impact ionization of Ganymede's O2 to 1.3-7.6×10^26 s^{-1} globally, dominating photoionization and driving 0.5-11 kg/s O2+ outflow.