Sq Variation of X, Y and Z Magnetic Field Elements at Bangui and Mbour

One year data of the hourly mean values of the X, Y and Z components of the Earth s magnetic field was used to study the Sq, daily variation at Bangui and Mbour. Both stations are located in the equatorial region. The study reveals a clear Sq, diurnal variation of day-to-day and monthly variability in X, Y and Z components in both stations; as it shows Sq variation consistent with the atmospheric dynamo action of the ionospheric E-region. Sq variation in X component was observed to be consistently in agreement with the daily variation pattern as suggested by other researchers. Abnormal Sq pattern was noticed in Y component in Bangui and in both Y and Z components in Mbour. These observed abnormal features may be due to an opposing stronger current to that of the Equatorial ElectroJet (EEJ) or cancellation of the EEJ. The average magnitude of the Sq variation observed in X component at Bangui and Mbour are approximately 50 and 45 nT, respectively and 20 and 15 nT in Y and Z components for Bangui and Mbour, respectively.