The role of hot oxygen on thermospheric OI UV airglow and density profiles
Hubert  B., Gerard  J.- C.,Cotton  D., Bisikalo  D. V., Shematovich, V. I.
J. Geophys. Res.,1999, 104, No. A8, 17139-17143.


The role of non thermal oxygen atoms in the vertical distribution of the 989 A OI EUV multiplet intensity is investigated using a thermospheric radiative transfer code. In particular, the role of the oxygen scale height change due to hot oxygen atoms is estimated for hydrostatic adjustment. The superthermal oxygen concentration and temperatures are derived from the O(3P) atoms energy distribution functions calculated by a Monte Carlo stochastic model. The density profile change due to the scale height effect is found to have a significant influence on the intensity profile of the oxygen optically thick EUV lines at 989 A. This contribution dominates the radiative transfer effect due to the perturbation of the Doppler profile by the hot O(3P) atoms. The intensity increase we calculate remains unsufficient to account for the EUV intensity measurements of the 989 A multiplet. Nevertheless, it is shown that the O(3P) thermospheric density profile must account for the scale height perturbation caused by the superthermal oxygen population which is non negligible above the exobase