Dipole/Quadrupole family modeling of paleosecular variation

Details Dipole/Quadrupole family modeling of paleosecular variation Dipole/Quadrupole family modeling of paleosecular variation

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311583m&link_type=abstract

Journal of Geophysical Research, Volume 93, Issue B10, p. 11583-11588

Physics

85

Geomagnetism And Paleomagnetism: Paleomagnetic Secular Variation, Geomagnetism And Paleomagnetism: Dynamo Theories, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term

Scientific paper

Contrary to previous claims that the VGP scatter and its latitude variation deduced from the present field are atypical of those for the past 5 m.y., it is shown that it is in fact typical when correctly calculated. A simple and effective model for the paleosecular variation of lavas is developed by using this important observation together with the dipole and quadrupole families from dynamo theory. The model predicts a latitudinal variation of VGP scatter, S, given by S=√A2λ2+B2, where λ is the latitude and A and B are parameters that depend on the contribution to the scatter from the dipole family and the quadrupole family, respectively. For the present field these parameters are estimated (95% confidence limits) as A=0.24+/-0.02 and B=13.5+/-0.6°, and for the past 5 m.y. as A=0.23+/-0.04 and B=12.8°+/-0.6°.

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