Magnetic signals from the core of the earth and secular variation

Details Magnetic signals from the core of the earth and secular variation Magnetic signals from the core of the earth and secular variation

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7957a&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 10, 1981, p. 7957-7965.

Physics

14

Dynamo Theory, Earth Core, Geomagnetism, Magnetic Dipoles, Secular Variations, Spherical Harmonics, Electromagnetic Wave Transmission, Magnetohydrodynamic Waves, Spatial Distribution, Wave Propagation

Scientific paper

An oscillating, radial magnetic dipole source is assumed to exist in the core of the earth, 100 km beneath the core-mantle boundary; it is also assumed that the propagation to the core-mantle boundary is electromagnetic rather than hydromagnetic in nature. Debye potentials are used to calculate the radial and horizontal components of the surface fields by various assumed conductivity parameters in the core and the mantle. It is concluded that most spherical harmonic models of the earth's magnetic field do not include enough terms to properly describe the field of core sources with periods of tens of years. Inadequate representation of these short-periods variations in spherical harmonic models may result in the rapid deterioration of predictive models. It is suggested that alternatives to spherical harmonic analysis for secular variation be investigated, and that methods be found for obtaining a much greater spatial distribution of high quality variation data.

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