Other
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1537v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Dec. 1986, p. 1537-1540. Research supported by the National Research Cou
Other
18
Earth Core, Geodynamics, Geomagnetism, Magnetic Variations, Secular Variations, Earth Mantle, Earth Surface, Insulation, Steady Flow, Velocity Distribution
Scientific paper
A new method for deriving steady surficial core motions from geomagnetic field models is presented and applied. The original method determines the steady velocity field at the top of a frozen-flux core which best fits, in both the spatial and temporal linear least squares sense, a model of the large scale geomagnetic secular variation (SV) at the base of a source-free mantle (Voorhies, 1986). New method is based upon the same physical assumptions, but fits SV at earth's surface instead of the core-mantle boundary (CMB). The newly derived flow differs somewhat from prior solutions, and shows but slight westward drift; however, other key global properties are virtually unchanged. Over a 15 year interval the new method provides a better fit to the time-varying geomagnetic field at earth's surface than does the old.
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