Physical constraints for the analysis of the geomagnetic secular variation

Details Physical constraints for the analysis of the geomagnetic secular variation Physical constraints for the analysis of the geomagnetic secular variation

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...32..114s&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 32, May 1983, p. 114-131. Sponsorship: Natural Environment R

Physics

18

Geomagnetism, Secular Variations, Earth Core, Earth Mantle, Harmonic Functions, Mathematical Models, Spline Functions, Tables (Data)

Scientific paper

The secular variation at the core-mantle boundary is presently modeled by fitting 15-year differences in the X, Y and Z component annual means, from 1959 to 1974. If the secular variation is attributed to core fluid motions, this model will yield the slowest core motions. In addition, the method allows a degree of misfit between model and observations, where objective criteria are used for determining the misfit on the basis of the assumption that diffusion is negligible. Minimum values circa 2 nT/year are obtained which correspond to errors of about 20 nT in individual annual means. This figure is noted to be larger than expected from the scatter in the data.

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