Motions at core surface in the geostrophic approximation

  • Le Mouël J
  • Gire C
  • Madden T
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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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  • J. L. Le Mouël

  • C. Gire

  • T. Madden

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