Physics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.3413g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, April 10, 1988, p. 3413-3420.
Physics
25
Earth Core, Earth Mantle, Geomagnetism, Geotemperature, Magnetic Field Configurations, Paleomagnetism, Atlantic Ocean, Dipole Moments, Dynamo Theory, Pacific Ocean, Quadrupoles, Secular Variations
Scientific paper
In this paper, the average expected magnetic field pattern of the earth is compared with the time-averaged field obtained from paleomagnetic pole position from the last 5 m.y. The historical record suggests that the time-averaged inclination anomalies are negative in the Atlantic region north of 30 deg S and in the west Pacific, and positive in the South Atlantic, extreme North and South Pacific, and east Pacific. The pole positions give positive inclination anomalies in the South Atlantic and extreme North Pacific and negative anomalies elsewhere, in agreement with theory except for the east Pacific. It is argued that the preponderance of negativeness in the paleomagnetic record is a consequence of the present distribution of temperature at the base of the mantle rather than a fundamental property of the geodynamo, and it may therefore change on the long time scale of mantle convection.
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