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The evening pre-reversal vertical drift velocity\udenhancement (PRE) constitutes an important seeding mechanism for the\udgeneration of F region irregularities. Ion density and drift measurements\udfrom ROCSAT-1 and DMSP satellites are used to examine the correlation of\udlongitudinal/seasonal (l/s) variations in the evening pre-reversal vertical\uddrift velocity at the magnetic equator in the topside ionosphere and the\udplasma bubble (PB) occurrence probability. The analysis performed for three\udyears 2000–2002 (solar maximum), provides consistent evidence as the ground\udobservations that the equatorial PB occurrence is dependent on and increases\udapproximately linearly with PRE, and the l/s variations of PRE play an\udimportant role in the global l/s distribution of PB occurrence. The\udsolstitial evening PRE and equatorial PB occurrence show similar\udlongitudinal variations: During June solstice, two peaks appear in the\udAfrican and Pacific longitude sectors, and two minimums are observed in the\udIndian and American regions; During December solstice, the situation is\udapproximately opposite. The equinoctial longitudinal effects are comparably\udsmall. It is concluded that the large-scale l/s variations of equatorial PB\udoccurrence can be closely related to the l/s variations of PRE

The correlation of longitudinal/seasonal variations of evening equatorial pre-reversal drift and of plasma bubbles