Articles | Volume 26, issue 5
Ann. Geophys., 26, 1159–1169, 2008
https://doi.org/10.5194/angeo-26-1159-2008

Special issue: Atmospheric studies by optical methods

Ann. Geophys., 26, 1159–1169, 2008
https://doi.org/10.5194/angeo-26-1159-2008

  28 May 2008

28 May 2008

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

A. S. Kirillov 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.