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Gao, X. Q.
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- PublicationOpen AccessThe separation of the geomagnetic field originated in the core, in the asthenosphere, and in the crust(1999-04)
; ; ; ; ;Gregori, G. P.; Istituto di Fisica dell’Atmosfera (IFA-CNR), Roma, Italy; and World Laboratory, Lausanne, Switzerland ;Dong, W. J.; World Laboratory Scholarship, c/o IFA (CNR), Roma, Italy ;Gao, X. Q.; World Laboratory Scholarship, c/o IFA (CNR), Roma, Italy ;Gizzi, F. T.; European Commission Scholarship, c/o IFA (CNR), Roma, Italy; ; ; The separation of the field produced by different internal sources can be accomplished by means of the so-called spatial spectrum of the geomagnetic field of internal origin. It is shown how such a rationale, when suitably interpreted, allows to recognize the field that is originated by electric currents that flow either on the Inner-Core Boundary (ICB), or on the Core-Mantle Boundary (CMB), or on the Asthenosphere-Lithosphere Boundary (ALB). It appears crucial, however, to rely on satellite measurements alone, because ground-based and ship- and air-borne records are severely perturbed by the crustal field. Therefore, it is shown, on the basis of a critical reconsideration of a few key-papers in the literature, that the best approach is to avoid mixing together all kinds of measurements. Satellite data are best suited for recognizing the dynamo field, while ground-based, ship- and air-borne records, which are measured much closer to crustal sources, are best suited, after subtraction of the satellite-derived dynamo field, for inferring the geomagnetic anomalies that are to be associated with crustal sources alone.236 182