Physics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29r...1b&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 18, pp. 1-1, CiteID 1854, DOI 10.1029/2001GL014543
Physics
19
Geomagnetism And Paleomagnetism: Core Processes (8115), Geomagnetism And Paleomagnetism: Dynamo Theories, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term
Scientific paper
Using a numerical dynamo model, we examine whether quasi-stationary high latitude flux bundles which are observed in the geomagnetic field over the last 300 years, and possibly over much longer time periods, result from thermal core-mantle interactions. We do so by imposing lateral heat flux variations at the core-mantle boundary based upon the dominant pattern of seismic heterogeneity in the lowermost mantle. We find that the time-averaged field then has a similar arrangement of flux bundles to that observed during the last few hundred years. However, the field is time-dependent, and this arrangement of flux bundles is not a feature of the field at all times.
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