Abstract
In this work, we use data of nine years (1989 to 1997) at all IRIS sites (Culgoora, Kumbel, Oukaimeden, Izana, La Silla and Stanford, devoted to the study of the solar velocity oscillation) to study of diurnal atmospheric extinction coefficient behaviour at Oukaimeden observatory and to compare it to the others. By this study, we can conclude that the mean extinction coefficient at Oukaimeden is around 0.120 mag airmass-1. Besides, we show that the daily extinction coefficient varies under the influence of the seasonal effect. By the comparison of Oukaimeden to the other sites, we showed that Oukaimeden has a good photometric sky quality and constitutes a potential site for astronomical observations in the north hemisphere.
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