Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..288m&link_type=abstract
(American Geophysical Union, Session on Irregularities in the Secular Variation and Geodynamic Implications, Cincinnati, OH, May
Physics
5
Energy Distribution, Geomagnetism, Secular Variations, Vertical Distribution, Earth Core, Earth Mantle, Magnetic Dipoles, Spherical Harmonics
Scientific paper
The dipole part of the geomagnetic main field loses its predominant role with the secular variation of mean energy density if the description is reduced to the depth of the source-layer, about 100 km below the core-mantle boundary, as revealed from the spatial spectrum of the field. The magnetic mean energy density at that level is already balanced if only two more spectrum terms, i.e., the quadrupole and octupole constituents, are included. The result is in accordance with the idea of conservation of energy density as inferred from the variation of the spectrum. It supports the concept of the presently observed secular variation to be caused primarily by structural changes of the current system in the source-layer, associated with an exchange of energy between spherical harmonic constituents of different degrees, without involving a systematic change of the generation mechanism.
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