The equatorial electrojet strengths are computed by a simple technique at Indian and American sectors utilising the hourly mean values of the horizontal component (H) of the geomagnetic field at pairs of appropriately selected observatories. After testing the validity of the index to its faithful representation of the strengths, detailed comparative study of the monthly mean and seasonal behaviours of the diurnal variations at the two sectors for low solar activities are made.
The diurnal variations would permit themselves in identifying the intervals of “Counter electrojet” events separately during the “morning” and “afternoon” hours. Besides the morphological features of this special phenomenon at the two sectors, their dependence on the degree of magnetic activity and lunar control are studied and the results are reported. In the seasonal progression of the occurrence of counter electrojet, during low solar activity period, the afternoon/early evening events are confined to J-season at Indian sector whereas they are observed more frequently in the morning hours in the D-season at American sector. During high solar activity years, morning counter electrojet events are larger in number in both the sectors. Lunar influence on the occurrence frequency of the counter electrojet appears to be confined to the morning events only.