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The Alice ultraviolet spectrograph on the European Space Agency Rosettaspacecraft observed comet 67P/Churyumov-Gerasimenko in its orbit around the Sunfor just over two years. Alice observations taken in 2015 October, two monthsafter perihelion, show large increases in the comet's Ly-$\beta$, O I 1304, O I1356, and C I 1657 $\AA$ atomic emission that initially appeared to indicategaseous outbursts. However, the Rosetta Plasma Consortium instruments showed acoronal mass ejection (CME) impact at the comet coincident with the emissionincreases, suggesting that the CME impact may have been the cause of theincreased emission. The presence of the semi-forbidden O I 1356 $\AA$ emissionmultiplet is indicative of a substantial increase in dissociative electronimpact emission from the coma, suggesting a change in the electron populationduring the CME impact. The increase in dissociative electron impact could be aresult of the interaction between the CME and the coma of 67P or an outburstcoincident with the arrival of the CME. The observed dissociative electronimpact emission during this period is used to characterize the O2 content ofthe coma at two peaks during the CME arrival. The mechanism that could causethe relationship between the CME and UV emission brightness is not wellconstrained, but we present several hypotheses to explain the correlation.

Ultraviolet Observations of Coronal Mass Ejection Impact on Comet 67P/Churyumov-Gerasimenko by Rosetta Alice