Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ecis..306..179h&link_type=abstract
(Royal Society, Discussion on the Earth's Core: Its Structure, Evolution and Magnetic Field, London, England, Jan. 27, 28, 1982.
Physics
Earth Core, Mathematical Models, Planetary Magnetic Fields, Harmonic Functions, Magnetic Dipoles, Secular Variations
Scientific paper
It is suggested that radial off-center dipoles located within the core of the earth be used instead of spherical harmonics of the magnetic potential in modeling the core magnetic field. The off-center dipoles, in addition to more realistically modeling the physical current systems within the core, are if located deep within the core more effective at removing long wavelength signals of either potential or field. Their disadvantage is that their positions and strengths are more difficult to compute, and such effects as upward and downward continuation are more difficult to manipulate. It is nevertheless agreed with Cox (1975) and Alldredge and Hurwitz (1964) that physical realism in models is more important than mathematical convenience. A radial dipole model is presented which agrees with observations of secular variation and excursions.
Carle H. M.
Harrison Christopher G. A.
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