Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...20...83y&link_type=abstract
(Topical Conference on Origins of Planetary Magnetism, Houston, Tex., Nov. 8-11, 1978.) Physics of the Earth and Planetary Inter
Physics
2
Geomagnetism, Magnetic Dipoles, Magnetic Variations, Paleomagnetism, Secular Variations, Drift, Harmonic Analysis, Magnetic Anomalies, Magnetic Moments, Spherical Harmonics
Scientific paper
A review of geomagnetic secular variations on the historical time-scale is presented. The westward drift of the geomagnetic field is examined first; the nonaxisymmetric field during the past several hundred years can be approximated by the superposition of two constant-magnitude fields, a standing and a drifting field, whose lifetimes are supposed to be longer than 1000 years. The equatorial dipole field is likely to consist of a westward drifting component with normal velocity and an eastward drifting one with a small velocity. The time variation of the dipole field is examined, noting that an antiparallel relationship appears to exist between the dipole variations and the quadrupole field. Finally, characteristic oscillation periods of the dipole field are analyzed, showing that a 60-70-year, a 400-600-year, and an 8000-year period emerge as dominant periods.
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