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Physical interpretation ismade of the O+/Ne diurnal variations in summer, revealed by Litvineet al. (1998) from the EISCAT observations. It is shown that the observedanti-correlation between the Z50 parameter, corresponding to thetransition region between 50% of molecular and atomic ions, and the width Dzof the transition, defined as the altitude width between 10% and 90% of the O+/Neratio, can be reproduced in model calculations and the result of differentrecombination laws (quadratic in the lower and linear in the upper ionosphere)as well as diurnal variations in the photo-ionization rates. Key words.Ionosphere (ion chemistryand composition; modeling and forecasting

An interpretation of ion composition diurnal variation deduced from EISCAT observations