Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2081b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Nov. 1990, p. 2081-2084. Research supported by NSF and NASA.
Physics
18
Dynamo Theory, Earth Core, Geomagnetism, Lorentz Force, Secular Variations, Stratification, Geophysical Fluids, Reynolds Number, Stratified Flow, Structural Properties (Geology)
Scientific paper
The consequences of strong stable stratification at the top of the earth's fluid outer core are considered, concentrating on the generation of the geomagnetic secular variation. It is assumed that the core near the core-mantle boundary is both strongly stably stratified and free of Lorentz forces: it is found that this set of assumptions severely limits the class of possible motions, none of which is compatible with the geomagnetic secular variation. Relaxing either assumption is adequate: tangentially geostrophic flows are consistent with the secular variation if the assumption that the core is strongly stably stratified is relaxed (while retaining the assumption that Lorentz forces are negligible); purely toroidal flows may explain the secular variation if Lorentz forces are included.
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