Abstract
A study of the zonal plasma bubble drift velocities is carried out using experimental airglow data registered at Cachoeira Paulista (22.50 S, 450 W, dip 300 S) during the period from October to March, between 1980-1994. This study is based upon 111 nights of zonal scanning photometer measurements of OI 630 nm airglow. The zonal velocity magnitudes of the ionospheric bubbles are investigated taking into account the geomagnetic effects. A detailed analysis of these plasma bubble velocities, as a function of geomagnetic activity, shows that the velocity variations expressed Vfinal – Vinicial are less during quiet nights than during disturbed nights. In addition it is noted that the mean velocities present the highest (lowest) values during quiet (disturbed) nights of solar maximum (minimum).
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