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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