A detailed study of the zonal drift velocities of the<br>ionospheric bubbles is carried out using experimental<br>airglow data registered at Cachoeira Paulista (22.5 S,<br>45 W, dip 30 S) during the period of October to<br>March, between 1980-1994. This study is based upon<br>172 nights of zonal scanning photometer measurements<br>of OI 630 nm airglow. The zonal velocity<br>magnitudes of the ionospheric bubbles are investigated<br>taking into account the solar effects. In general,<br>it is verified that the zonal velocities of the bubbles<br>increase with solar flux F10.7 cm. Analysis of the<br>monthly variations shows that the velocities tend to<br>decrease faster with local time during solar minimum<br>than during solar maximum.


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