AVERAGE EQUATORIAL ZONAL AND VERTICAL ION DRIFTS DETERMINED FROM SAN-MARCO D-ELECTRIC-FIELD MEASUREMENTS

San Marco D electric field measurements have been averaged in-terms of their equivalent ion drift to produce an average pattern of equatoria l zonal and vertical ion drifts. Variations with season, solar activit y, Kp, lunar phase and longitude have been analyzed. Similarities and some differences from previous Jicamarca, DE 2 and AE-E results are se en. Confirmation is given of the dominance of the F region dynamo in t he 1900-2100 local time region. The daytime zonal ion drift is larger for high F10.7 values than that for low values. There is little variat ion between high and low values of Kp. Superrotation is evident in thi s data set and is larger at equinox compared to solstice. At the June solstice there are significant differences between the average ion dri fts in the longitude sector where the geomagnetic equator is north of the geographic equator (Indian sector) and the sector where the geomag netic equator is south of the geographic equator (Peruvian sector). Th e daytime upward velocity is larger in the Indian sector than in the P eruvian sector, and it reverses later in the evening in the Indian sec tor. Daytime westward zonal velocities are larger and the nighttime ea stward velocities are smaller in the Indian sector. A presunrise enhan cement is seen in the downward velocity in the Indian sector but not i n the Peruvian sector. Significant variations are also seen with the p hase of the moon. In light of current theory, the lunar variations sug gest a complex interaction of E and F region dynamo sources with condu ctivity, changing in phase and character with latitude.