“…The zonal electric field (due to global scale dynamo action), which is responsible for EIA, also causes an intense band of current in the E-region of the equatorial ionosphere known as the equatorial electrojet (EEJ), which generally shows a diurnal pattern with peak amplitudes at local noon. However, even during geomagnetically "quiet" periods, for reasons still being debated (Raghavarao et al, 1980;Somayajulu et al, 1993, Stening et al, 1996, the primary zonal electric field changes its direction from eastward to westward during daytime (Gouin and Mayaud, 1967), which is known as the "Counter Electrojet" (CEJ). Earlier investigations (Raghavarao et al, 1978) revealed that the strength of the EIA has a high degree of cor- The fitted polynomial routine is represented by a solid line, while the width, which is the time interval corresponding to .8 of the maximum intensity, is denoted by the dotted lines in Fig.…”