Dipolar reversal states of the geomagnetic field and core-mantle dynamics
Article Abstract:
The two inclined dipolar field configurations detected in paleomagnetic data from lavas have probably characterized the geomagnetic reversals that have taken place during the last 10 million years. Moreover, these configurations agree rather than conflict with the data derived from sedimentary rocks, particularly the tendency for the virtual geomagnetic pole to follow either of two paths during reversals: one moving through North and South America and the other through eastern Asia and western Australia. In addition, the geomagnetic data may result from conditions at the Earth's core and mantle.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Polar path in geomagnetic reversals
Article Abstract:
Geomagnetic reversals have a tendency to to move either across North and South America or 180 degrees away near Australia and East Asia. This may be accounted for by hypothesizing that the varying core dynamo field is covered by a highly conducting layer which is insulating everywhere but under the Pacific hemisphere where it has metallic conductivity. Paleomagnetic data, from the Triassic and other time periods, support this hypothesis as the most plausible explanation for geomagnetic variation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Longitudinally confined geomagnetic reversal paths from non-dipolar transition fields
Article Abstract:
A new model explains the apparent tendency of the virtual geomagnetic pole (VGP) to favor certain longitudinal routes during geomagnetic reversals. The model holds that VGP paths must stay within narrow longitude bands even though the transition field between the Earth's mantle and core is non-dipolar in structure. Moreover, under this model VGP paths indicate core-mantle interaction but not near-dipolar transition fields.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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