Evidence for dipolar fields during the Cobb Mountain geomagnetic polarity reversals

Article Abstract:

New geomagnetic reversal records from the Cobb Mountain subchron in the western Pacific indicate that the sequential locations of the virtual geomagnetic poles (VGPs) resemble the sequences of VGPs detected in the North Atlantic and Tahiti. This discovery bolsters the view that dipolar transitional fields were a feature of Cobb Mountain reversals. Moreover, this finding complements earlier evidence for large-scale symmetries in the VGPs. This research should help scientists to understand how the Earth's magnetic field has operated during reversals.

Magnetic dipoles, Dipoles (Electromagnetism)

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The last two geomagnetic polarity reversals recorded in high-deposition-rate sediment drifts

Article Abstract:

Transition records from North Atlantic drift deposits with high sedimentation rates at the Ocean Drilling Program sites 983 and 984 reveal virtual geomagnetic polar (VGP) paths that are similar within and between sites for the last two geomagnetic polarity reversals. This indicates a memory effect linking back-to-back reversals. No other sedimentary polarity transition records reveal similar clustering of VGPs, although there are no other polarity transition data from sediments with comparable accumulation rates.

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Do virtual geomagnetic poles follow preferred paths during geomagnetic reversals?

Article Abstract:

Geomagnetic data are generally cited to support the hypothesis that the virtual geomagnetic poles tended to follow two antipodal paths during reversals. However, a new statistical test of these data show that the correspondence in Equator crossings is accidental rather than a genuine correlation. This lack of support for the preferred paths hypothesis also casts doubt on the related hypothesis that the Earth's mantle affects the core while reversals are in progress.

Models, Earth, Structure

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