Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.358..230c&link_type=abstract
Nature (ISSN 0028-0836), vol. 358, no. 6383, July 16, 1992, p. 230-233. Research supported by NSF.
Other
48
Geomagnetism, Magnetic Field Inversions, Magnetic Poles, Paleomagnetism, Secular Variations, Earth Surface, Spherical Harmonics
Scientific paper
Recent work has indicated that the transitional paths of virtual geomagnetic poles for the past few geomagnetic reversals are located preferentially within two antipodal longitudinal bands, suggesting that simple but nonzonal field configurations dominate during reversals. It is pointed out that one of the longitudinal bands coincides with that expected from the reversal of a non-axial-dipole field exactly like that present today; the other requires only a sign change in the non-axial-dipole terms of today's field. Evidence for persistent nonzonal contributions to the field has generally been regarded as not statistically significant because of poor data distributions. It is shown here that a nonzonal bias, similar to that observed in reversal data, is evident in data on secular variation of the field over the past 5 Myr, even after normalization according to site locations. These results suggest that the time-averaged field does indeed contain persistent nonzonal contributions.
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