N2 vibrational distribution in aurorae

Abstract The N 2 vibrational distribution is calculated for a specific IBC Class II aurora using as input, data obtained from coordinated rocket and satellite observations and currently accepted excitation and quenching rates. The results of the calculations indicate no significant vibrational enhancements for this specific aurora nor for “upper limit” estimates for more intense aurorae. We conclude from this study that if significantly larger concentrations of vibrationally excited N 2 molecules exist in the aurora, as recent rocket e.u.v. measurements suggest, current concepts of the sources and sinks of N 2 vibrational excitation will require significant revision.