The electron impact and dissociative recombination source functions of O(1D) in aurora are examined. The data from nine AE-D passes plus one rocket flight are examined at altitudes between 150 km and 335 km. It is found that in nightime aurora 90% of the total source function is unidentified below 200 km. Electron impact (including thermal electrons) and dissociative recombination are probably adequate source functions above 250 km.