Measurements of the large-scale direct-current earth potential and possible implications for the geomagnetic dynamo

Details Measurements of the large-scale direct-current earth potential and possible implications for the geomagnetic dynamo Measurements of the large-scale direct-current earth potential and possible implications for the geomagnetic dynamo

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...229...47l&link_type=abstract

Science (ISSN 0036-8075), vol. 229, July 5, 1985, p. 47-49.

Physics

17

Dynamo Theory, Electric Potential, Geomagnetism, Communication Cables, Direct Current, Earth Core, Earth Mantle

Scientific paper

The magnitude of the large-scale direct-current earth potential was measured on a section of a recently laid transatlantic telecommunications cable. Analysis of the data acquired on the 4476-kilometer cable yielded a mean direct-current potential drop of less than about 0.072 + or 0.050 millivolts per kilometer. Interpreted in terms of a generation of the potential by the earth's geodynamo, such a small value of the mean potential implies that the toroidal and poloidal magnetic fields of the dynamo are approximately equal at the core-mantle boundary.

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