Abstract
The electrical conductivity of the Earth’s upper mantle can be inferred from geomagnetic quiet-day, S q , variations recorded at the world’s observatories using the coefficients of a spherical harmonic analysis (SHA) that separate the external (source) and internal (induced) parts of the surface field. The conductivity profile determined from such an analysis can be sensitive to special characteristics of the quiet field itself as well as the separation techniques employed. This review of the Sq-analysis features critical to a conductivity derivation is pictorially presented along with the equations for application of the Schmucker (1970) technique to the SHA coefficients for a conductivity determination. Three examples illustrate the use of these equations with different S q models.
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© 1987 Birkhäuser Verlag, Basel
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Campbell, W.H. (1987). The Upper Mantle Conductivity Analysis Method Using Observatory Records of the Geomagnetic Field. In: Campbell, W.H. (eds) Electrical Properties of the Earth’s Mantle. Pageoph Topical Volumes. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-7373-4_12
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DOI: https://doi.org/10.1007/978-3-0348-7373-4_12
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