The discrepancy reduces to 30-80% if the photon electron impact and photodissociation of N [SUB] 2 [/SUB] sources of N ([ SUP] 4 [/SUP] S) atoms are considered as optically thin.
We find that the O, N [SUB] 2 [/SUB] and CO densities from the empirical VTS3 model provide satisfactory agreement between the calculated and the observed EUV airglow emissions.