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Etude des mouvements à la surface du noyau terrestre : du 17ème au 21ème siècle

Abstract : In order to study the dynamics of the Earth's outer core, we compute core surface flows from observations of the main magnetic field. The relevance of these computations is confirmed by the similarities of the flows obtained with two independent methods and the results of different synthetic tests. Two different kind of observations are used: ground-based observations for the time period 1590-1990 and recent high-resolution satellite observations. We thus obtain a time series of the historical flows as well as a detailed model of the present flow. The evaluation of errors associated to these flows enable us to identify their reliable features. The velocity fields we obtain are in good agreement with different phenomena appearing in 3D-simulations of core dynamics. We also show that geomagnetic jerks have an explicit signature in
core surface dynamics. In the last chapter, a variational data assimilation method for the study of the Earth's core is introduced.
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https://tel.archives-ouvertes.fr/tel-00007173
Contributor : Céline Eymin <>
Submitted on : Thursday, October 21, 2004 - 11:51:20 AM
Last modification on : Wednesday, December 9, 2020 - 3:11:52 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:34:30 PM

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  • HAL Id : tel-00007173, version 1

Citation

Céline Eymin. Etude des mouvements à la surface du noyau terrestre : du 17ème au 21ème siècle. Géophysique [physics.geo-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00007173⟩

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