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The westward drift of the South Atlantic Magnetic Anomaly
O. Pinto, W. D. González, Pinto, Iara Regina Cardoso de Almeida
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Abstract
The westward drift of the South Atlantic Magnetic Anomaly (SAMA) has long been known. Recent computations based on an eccentric geomagnetic dipole, as compared with archeomagnetic data obtained in South America, seem to indicate that the SAMA region has a periodic movement around the Earth with a period of about 2300 years. We think that this evidence may contribute to a better understanding of the complex physical processes occurring in the Earth's liquid core, where the magnetic field originates.