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• W2039552405 abstract "Variations in the Earth’s lower mantle appear to influence the geodynamo operating in the liquid core. We present a solution to the full dynamo equations with lateral variations in heat flux on the outer boundary defined by the shear wave velocity of the lowermost mantle. The magnetic field is almost stationary and locked to the boundary, with 4 symmetrical concentrations of flux sited beneath cold mantle. This allows for the first time a direct comparison between a dynamo solution and the main features of the present geomagnetic field. Of the four main equatorially symmetric flux lobes, two (the “Siberian” pair) are centered within 5° of the corresponding Earth’s pair; the other two (the “Canadian” pair) are not quite so close but are more mobile, as the corresponding Earth’s pair have been in the last 300 years. Our study strongly suggests that geomagnetic field morphology is dominated not only by geometry related to the inner core but also by structure in the bottom few hundred kilometres of the mantle, notably the seismically fast ring beneath the Pacific rim and large fast anomalies beneath Siberia and Canada. Tighter locking of one of the pairs of flux lobes suggests the seismic anomaly beneath the Siberian side of the ring is in some way stronger than the one on the Canadian side. These locked solutions only occur for a limited parameter range with the large Ekman numbers available to numerical experiments, which explains why none have been found earlier. This solution provides an important starting point for further searches for dynamos with realistic geomagnetic fields." @default.
• W2039552405 created "2016-06-24" @default.
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• W2039552405 date "2007-07-01" @default.
• W2039552405 modified "2023-10-01" @default.
• W2039552405 title "Correlation of Earth’s magnetic field with lower mantle thermal and seismic structure" @default.
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• W2039552405 doi "https://doi.org/10.1016/j.pepi.2007.04.014" @default.
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