New evidence for the extraordinarily rapid change of the geomagnetic field during a reversal

Article Abstract:

Brief episodes of rapid field changes of six degrees per day are indicated by the paleomagnetic results from geomagnetic polarity reversals recorded in Steens Mountain, Oregon. The hypothesis that the field was changing direction as the flow cooled is supported by large, systematic variations in the direction of remanent magnetization within a single flow. However, the current theory of geomagnetic reversals occurring a minimum of several thousand years apart is not overturned because the episodes of rapid field change may have occurred many times within a polarity transition.

Lava

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Geomagnetic reversal paths

Article Abstract:

The idea that the transitional field virtual geomagnetic pole (VGP) paths do not tend to move along the longitudinal band over North and South America and to a lesser extent their antipodes during geomagnetic reversals is based on a faulty analysis of the paleomagnetic statistical data. J.P. Valet and colleagues' questionable statistical analysis led them to decide erroneously that the VGPs' lack a preferred sector of longitude during reversals. The use of circular statistical techniques demonstrates that such preferred paths did exist.

Statistics, Paleomagnetism

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The role of the Earth's mantle in controlling the frequency of geomagnetic reversals

Article Abstract:

Computer simulations of the Earth's dynamo shows how the thermal structure of the lower mantle could affect convection and magnetic-field generation in the fluid core. Spontaneous magnetic dipole reversals and excursions were found to occur, indicating correlations among the frequency of reversals, and the duration over which they occur.

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