  The Alice ultraviolet spectrograph on the European Space Agency Rosetta
spacecraft observed comet 67P/Churyumov-Gerasimenko in its orbit around the Sun
for just over two years. Alice observations taken in 2015 October, two months
after perihelion, show large increases in the comet's Ly-$\beta$, O I 1304, O I
1356, and C I 1657 $\AA$ atomic emission that initially appeared to indicate
gaseous outbursts. However, the Rosetta Plasma Consortium instruments showed a
coronal mass ejection (CME) impact at the comet coincident with the emission
increases, suggesting that the CME impact may have been the cause of the
increased emission. The presence of the semi-forbidden O I 1356 $\AA$ emission
multiplet is indicative of a substantial increase in dissociative electron
impact emission from the coma, suggesting a change in the electron population
during the CME impact. The increase in dissociative electron impact could be a
result of the interaction between the CME and the coma of 67P or an outburst
coincident with the arrival of the CME. The observed dissociative electron
impact emission during this period is used to characterize the O2 content of
the coma at two peaks during the CME arrival. The mechanism that could cause
the relationship between the CME and UV emission brightness is not well
constrained, but we present several hypotheses to explain the correlation.
