On the variability of I(7620 Å)/I(5577 Å) in low altitude aurora

E. J. Llewellyn, R. L. Gattinger, A. Vallance Jones
1999 Annales Geophysicae  
An auroral electron excitation model, combined with simple equilibrium neutral and ion chemistry models, is used to investigate the optical emission processes and height pro®les of I(5577 A Ê ) and I(7620 A Ê ) in the 90 to 100 km altitude region. It is shown that the apparent discrepancies between groundbased and rocket-borne auroral observations of the I(7620 A Ê )/I(5577 A Ê ) ratio are due to the extreme height variation of this intensity ratio in the 90 to 100 km region.
doi:10.1007/s00585-999-0913-8 fatcat:bjpffpvvtnhjlpei5foiqbtezu