Coupling of the core dynamo and mantle: thermal or topographic?

Details Coupling of the core dynamo and mantle: thermal or topographic? Coupling of the core dynamo and mantle: thermal or topographic?

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1521g&link_type=abstract

Geophysical Research Letters, Volume 13, Issue 13, p. 1521-1524

Physics

39

Scientific paper

Static features in the earth's magnetic field and fixed sources of secular variation suggest the dynamo is anchored to the lowermost mantle via either thermal or topographic coupling. Here we show a correspondence with dynamic core topography, which is related to mantle temperature, and suggest further effects due to topography associated with subducting slabs. The two coupling mechanisms may occur on different time scales, providing a potential means for discriminating between them.

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