Broadfoot's (1967) theory for fluorescent scattering of sunlight by N2 + in high-altitude auroral rays is updated with new radiative and electron impact cross sections and extended to include the analogous process of fluorescence induced by low energy electrons. The two mechanisms account successfully for the observed vibrational enhancement of the first negative system in both the sunlit and non-sunlit phases of the great type-A red aurora of February 10, 1958, without recourse to proton precipitation as has commonly been suggested, and permit a number of conclusions regarding vibrational temperatures, ion lifetimes, and the role of electron fluxes. In the cusp the agreement is not very conclusive as yet, although a recently published single set of a data suggest that the cusp was totally sunlit at the time. Recalculated g-values for solar scattering and corresponding arrays of band intensities of the first negative and Meinel system are given. Laboratory beam parameters often lie well within the range of the model prediction, suggesting a means of controlled study of the proposed electron-induced fluorescence mechanism.