Abstract
Available data of the ancient geomagnetic field intensity determined by the archeomagnetic measurement are compared with theoretically calculated curves of secular variation in the geomagnetic total force at three mutually remote sites. It is particularly remarkable that the anomalous archeomagnetic results from equatorial America (Peru, Bolivia and Mexico) can be accounted for by the model including the westerly drifting components of non-dipole field superposed on the standing non-dipole and the oscillating dipole fields. The good agreement of the archeomagnetic date and the calculated curves may imply that the drifting non-dipole field given in Yukutake's model has been persistent over the past 4, 000 years.
