Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..217y&link_type=abstract
(American Geophysical Union, Session on Irregularities in the Secular Variation and Geodynamic Implications, Cincinnati, OH, May
Physics
13
Geomagnetism, Normal Density Functions, Secular Variations, Astronomical Models, Drift Rate, Spherical Harmonics
Scientific paper
Secular variations in the geomagnetic field are analyzed, with emphasis given to the time changes in the Gauss coefficients since 1600 AD. Major portions of the history of the time variations are represented graphically within the framework of a two-mode model consisting of a standing and drifting component. The model was modified to remove coefficients which depict an elliptical trajectory rather than a circular one. The methods used to modify the two-mode model included: assuming the variability of the amplitude terms of the drifting component; and introducing a second drifting mode. In the modified three-mode model, the westward drifting mode dominates the eastward mode, without assuming amplitude variation. Field trajectories are calculated using the three-mode models and the results are compared with observatory data.
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