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Modelling of natural sources of magnetospheric origin in the interpretation of regional induction studies: A review

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Abstract

Traditional interpretation of regional induction studies relies on the assumption that the external inducing field is quasi-form. My review is devoted to as clear as possible a definition of the limitations of this assumption, which is not always justified. Therefore, I will first systematically describe the actual current systems responsible for induction at high, middle or low-latitudes, and then review the means presently available for taking their localised nature into consideration when interpretating surface electromagnetic data. Realistic source models will be presented for all latitudes.

Résumé

Les méthodes géophysiques traditionnelles basées sur l'induction électromagnétique régionale utilisent toutes l'hypothèse de base suivant laquelle le champ externe inducteur est quasi-uniforme. Puisque cette hypothèse n'est pas toujours justifiable, ma revue a pour but de définir ses limites aussi clairement que possible. Pour ce faire, je décrirai d'abord systématiquement les véritables systèmes de courants responsables de l'induction à hautes, moyennes ou basses latitudes, pour passer ensuite aux méthodes permettant de prendre en considération leur étendue limitée lors de l'interprétation d'observations de surface. Des modèles réalistes de sources seront présentés pour toutes latitudes.

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Mareschal, M. Modelling of natural sources of magnetospheric origin in the interpretation of regional induction studies: A review. Surv Geophys 8, 261–300 (1986). https://doi.org/10.1007/BF01904062

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