ABSTRACT
The hallmark of geomagnetic temporal variation is its variability. The variabilities exhibit regional as well as very wide coherence. Most of the sections on variabilities of geomagnetic regular variations invoked variabilities of electric fields and winds to explain geomagnetic variabilities. The flow patterns of the current systems responsible for variations in the current intensity of equatorial electrojet in January, April and July 1964 are produced by J. W. MacDougall. For the purpose of determining longitudinal variation of negative magnetic perturbation only abnormal phase quiet day events east of Hartland are considered in order to avoid contamination by secondary minimum. The peculiar latitudinal variation of superposed horizontal magnetic field should help to identify the tidal mode winds that can drive the single vortex current system. One difficulty is that the current flows across the equator and is largely diurnal.
