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Day-to-day fluctuations of the daily range of the geomagnetic field H at theequatorial electrojet stations Ancon (ANC, 77.0° W) and Sao Luis (SLZ,44.2° W) are described for the period January–June 1993. The H fieldstarted increasing between midnight and sunrise, reaching a peak shortlybefore noon. The daily range of H was maximum during March and April andminimum during June. Regardless of the month, the range in H wassignificantly larger at ANC than at SLZ. The 27-day running mean of the range ofH varied from 80 nT to 125 nT at SLZ and from 105 nT to 180 nT at ANC. Theday-to-day values of the range of H showed very faithful variations at thetwo stations. The deviations of the daily range of H from its 27-day runningmean values showed good correlation between the two stations. Some largestorm-time effects were seen at both stations. The correlation was stillsignificant, when data were corrected for <I>D<sub>st</sub></I> index values. It is suggestedthat the range in H at the two electrojet stations, separated by more than2000 km, are affected by some common sources other than the ring current, whichneed to be identified. Spectral analysis of the range of H shows remarkablesimilarity at the two stations, with a dominant period of 15 days at bothstations

Day-to-day correlation of equatorial electrojet at two stations separated by 2000 km