Modelling the geomagnetic main field and recent secular variation

Details Modelling the geomagnetic main field and recent secular variation Modelling the geomagnetic main field and recent secular variation

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gapfd..60....3b&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 60, Issue 1, pp.3-35

Physics

Fluid Dynamics

1

Geomagnetism, Main Geomagnetic Field, Secular Variation, Mathematical Modelling, Spherical Harmonic Analysis, Frozen-Flux Hypothesis

Scientific paper

The main geomagnetic field and its secular variation can tell us a great deal about the Earth's deep interior, and main-field and secular-variation models (particularly spherical harmonic models) are widely used in studies of the dynamics of the outer layers of the Earth's core. The data on which such models are based must be of the highest quality and must be distributed as homogeneously as possible worldwide. This paper describes the data available for global modelling in terms of their accuracy and distribution. It then reviews methods for modelling the geomagnetic field and its secular variation, including techniques such as harmonic spline expansions and stochastic inversion that have been specifically developed to produce field descriptions that are acceptably smooth at the core-mantle boundary. Finally, two sets of models are intercompared, one set having been produced using these specialised techniques and the other using more traditional methods. It is found that the former techniques have most effect for the earliest epoch (1945) considered, when the global data distribution was rather poor.

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