Testing recent geomagnetic field models via magnetic flux conservation at the core-mantle boundary

Details Testing recent geomagnetic field models via magnetic flux conservation at the core-mantle boundary Testing recent geomagnetic field models via magnetic flux conservation at the core-mantle boundary

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...48..350b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 48, Issue 3-4, p. 350-357.

Physics

9

Scientific paper

The 28 candidate main field models submitted for the International Geomagnetic Reference Field Model Revision 1985 reveal that a dramatic increase in the rate of decline of the Earth's total pole strength began around 1960. Nevertheless, all but one field model conserves the absolute magnetic flux linking the core-mantle boundary (CMB) fairly well during the 40 year time span 1945-1985. This supports the frozen-flux approximation on global length and decade time scales.
Geostrophic fluid motion at the top of a frozen-flux core conserves the total magnetic flux linking either geographic hemisphere of the CMB. This constraint is poorly satisfied by the candidate secular variation (SV) models. Yet other SV models truncated at higher degree, and models based upon temporal interpolation rather than extrapolation, satisfy this constraint very well.
These results lead us to make several recommendations for the 1985 and future IGRF revisions.

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