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A statistical study of the zonal drift velocities of the ionospheric plasmabubbles using experimental airglow data acquired at the low-latitude stationCachoeira Paulista (Geogr. 22.5° S, 45° W, dip angle 28° S) during the period ofOctober to March, between 1980 and 1994, is presented here. This study isbased on 109 nights of zonal plasma bubble velocity estimations asdetermined from bubbles signatures on the OI 630nm scanning photometerairglow data. The zonal velocity magnitudes of the plasma bubbles areinvestigated with respect to solar activity and local time. It is verifiedthat these velocities tend to increase with the solar EUV flux, using thesolar 10.7-cm radio flux as a proxy (F10.7). These velocities are seen to belarger during the solar maximum activity period than in the solar minimumperiod. As to the local time variation, they are seen to peak beforemidnight, in the 20:30-22:30 LT time frame, depending on the season. Theall-data plot based on the 109 nights of airglow experiments shows that theplasma bubble mean zonal drift velocities tend to decrease with local time,but they peak at 22:25 LT, where the velocity magnitude reaches 127.4ms<sup>-1</sup>.The zonal drift variations with local time and solar flux areshown in Figs. 1 and 2, respectively

Plasma bubble zonal velocity variations with solar activity in the Brazilian region