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Published online by Cambridge University Press: 01 November 2006
Latitudinal structure with four zones: two sub polar and two equatorial with 22-year period of polarity change is clearly demonstrated. The auto-correlation of the magnetic field has been calculated for all latitudes from 75 N to 75 S to study its temporal variability on a short and on a long term scale. The meridional drift of the magnetic field with 2–3 years periodicities has been clearly evidenced in the both hemispheres.