Abstract
Recently, Knudsen suggested that oxygen ion-ion neutralization might provide an important contribution to the ultraviolet oxygen nightglow observed on Ogo 4. The relative contribution of this process is compared with that provided by radiative recombination, and it is concluded that radiative recombination should always be dominant, unless presently accepted values of the pertinent rate coefficients are in error. When the F region electron concentrations are not abnormally large (i.e., NmF2<106 cm−3), the two mechanisms contribute comparable amounts of ultraviolet emission. It is also concluded that, unless certain of these coefficients are underestimated, the two mechanisms will not provide the observed intensity of the ultraviolet nightglow.
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