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Abstract

Motions at the top of the core which generate the observed Secular Variation (S.V.) field are computed. To reduce the well known ambiguity of the solution, two constraints are added: the flow is a large scale one and is geostrophic. The computed flow then has a very simple geometry; its poloïdal part is roughly axisymmetrical with respect to an equatorial diameter. This geometry is almost unchanged from 1970 to 1980 while the intensity of the velocity is nearly doubled. © 1985.

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Le Mouël, J. L., Gire, C., & Madden, T. (1985). Motions at core surface in the geostrophic approximation. Physics of the Earth and Planetary Interiors, 39(4), 270–287. https://doi.org/10.1016/0031-9201(85)90140-2

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