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Ann. Geophys., 26, 1159-1169, 2008
www.ann-geophys.net/26/1159/2008/
© European Geosciences Union 2008


Electronically excited molecular nitrogen and molecular oxygen in the high-latitude upper atmosphere

A. S. Kirillov
Polar Geophysical Institute of the Kola Science Centre RAS, Apatity, 184209, Russia

Abstract. Relative vibrational populations of triplet B3Πg, W3Δ,sub>u, B'3Σu states of N2 and the b1Σg+ state of O2 are calculated for different altitudes of the high-latitude upper atmosphere during auroral electron precipitation. It is shown that collisional processes cause a wavelength shift in the distribution of relative intensities for 1PG Δv=3 sequence of N2. The calculation of relative populations for vibrational levels v=1–5 of the b1Σg+ state in the auroral ionosphere has not given an agreement with experimental results. Preliminary estimation of the contribution of the reaction O2++NO to the production of O2(b1Σg+) on the basis of a quantum-chemical approximation does not allow for an explanation of the observable vibrational population of the b1Σg+ state in the aurora.

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