Abstract
The variations of plasma drift velocity measured at Jicamarca with Thomson scatter radar are studied in connection with the variation of ƒoF2 and the correlations of ƒoF2's between different stations in low latitude. It is inferred that the sunset peak of drift velocity shows similar annual variation for both 75°W and 120°E longitudes, and becomes small as the solar activity decreases. The post-sunset peak of ƒoF2 at subtropical region is caused by anomalously large upward drift at sunset near the Equator, and the high h m in December is ascribable to the integrated effect of large and long sunset bulge of upward drift velocity. There is also an evidence of neutral wind which affects the correlation between ƒoF2's of two stations and produces the longitudinal effect.
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