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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References
Campbell, W. H. (1976),Polar cap geomagnetic field responses to solar sector change. J. Geophys. Res.81, 4731–4743.
Campbell, W. H. (1982),Annual and semiannual changes of the daily quiet variations (Sq) in the geomagnetic field at North American locations. J. Geophys. Res.87,785–796.
Campbell, W. H. andAnderssen, R. S. (1983),Conductivity of the sub-continental upper mantle: An analysis using quiet-day geomagnetic records of North America. J. Geomag. Geoelectr.35,367–382.
Campbell, W. H. andMatsushita, S. (1973),Correspondence of solar field sector direction and polar cap geomagnetic field changes for 1965. J. Geophys. Res.78,2079–2087.
Campbell, W. H. andSchiffmacher, E. R. (1985),Quiet ionospheric currents of the Northern Hemisphere derived from geomagnetic field records. J. Geophys. Res.90,6475’6486; see also corrections in J. Geophys. Res.91,9023–9024, 1986.
Campbell, W. H. andSchiffmacher, E. R. (1986),Quiet ionospheric currents and Earth conductivity profile computed from quiet time geomagnetic field changes in the region of Australia. Aus. J. Phys., 40, (in press).
Carovillano, R. L. andForbes, J. M. (1983),Solar-terrestrial physics; principles and theoretical foundations. D. Reidel Pub. Co., 859 p.
Chapman, S. andBartels, J. (1940),Geomagnetism. University Press, Oxford, 1049 p.
Cleveland, W. S. (1979),Robust locally weighted regression and smoothing scatter plots. J. Am. Statistical Assn.74,829–833.
Fesen, C. G.,Dickinson, R. E. andRoble, R. G. (1986),Simulation of the thermospheric tides at equinox with the National Center for Atmospheric Research thermospheric general circulation model. J. Geophys. Res.91,4471–4489.
Jones, A. G. (1983),On the equivalence of the ’Niblett’ and ’Bostick’ transformations in the magnetotelluric method. J. Geophys. Res.53,72–73.
Matsushita, S. (1967),Solar quiet and lunar daily variation fields,In Physics of Geomagnetic Phenomena (eds S. Matsushita and W. H. Campbell). Academic Press, New York, 302–424.
Matsushita, S. andCampbell, W. H. (1972),Lunar semidiurnal variations of the geomagnetic field determined from the 2.5-min data scalings. J. Atmos. Terr. Phys.34,1187–1200.
Matsushita, S. andMaeda, H. (1965),On the geomagnetic solar quiet daily variation field during the IGY. J. Geophys. Res.70,2535–2558.
Matsushita, S.,Tarpley, J. D. andCampbell, W. H. (1973),IMF sector structure effects on quiet magnetic field. Radio Sci.8,963–972.
Mayaud, P. N. (1980),Derivation, meaning, and use of geomagnetic indices. Amer. Geophys. Union, Washington, D.C., 154 p.
Meyers, H. andAllen, J. H. (1977).Some summary geomagnetic activity data, 1932’1976, NGSDC Data Fact Sheet No. 1. World Data Center A. NOAA, Boulder, Colorado, USA, 12 p.
Olson, W. P. (1970),Variations in the Earth’s surface magnetic field from the magnetopause current system. Planet. Space Sci.18,1471–1484.
Parkinson, W. D. (1983),Introduction to Geomagnetism. Scottish Academic Press, Edinburgh, 433 p.
Schmucker, U. (1970),An introduction to induction anomalies. J. Geomag. Geoelectr.22,9–33.
Schmucker, U. (1979),Erdmagnetische Variationen und die electrische Leitfähigkeit in tieferen Schichten der Erde. Sitzungsberichte u. Mitteilungen der Braunschweigischen Wissenschaftlichen Gesellschaft4,45–102.
Shankland, T. J. andWaff, H. S. (1977),Partial melting and electrical conductivity anomalies in the upper mantle. J. Geophys. Res.82,5409–5417.
Walker, E. (1866),Terrestrial and Cosmical Magnetism. Deighton, Bell, and Co., Cambridge.
Weidelt, P.,Müller, W.,Losecke, W. andKnödel, K. (1980),Die Bos tick Transformation,In Protokoll über das Kolloquium Elektromagnetische Tiefenforschun (eds. V. Haak and J. Homilius). Berlin-Hannover, pp. 227–230.
Wilkinson, D. C. (1986), Personal communication. National Geophysical Data Center, World Data Center A, NOAA, Boulder, Colorado, USA.
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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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