Westward drift, core motions and exchanges of angular momentum between core and mantle View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1988-05

AUTHORS

D. Jault, C. Gire, J. L. Le Mouel

ABSTRACT

The westward drift is one of the most well known features of the geomagnetic field. In this paper we come back to the apparent drift of the main field as seen at the Earth's surface, and show that there is no evidence for a body drift but rather clear evidence for a latitude-dependent drift. Computing the fluid flow at the core mantle boundary (CMB), in the frozen flux and geostrophic hypothesis, we also obtain, among other components, a clear differential zonal rotation of the fluid, symmetrical with respect to the Equator. This differential rotation changes with time, with a time constant of the order of 10 years. Dynamic considerations lead us to think that, during such a time interval, the change in the zonal toroidal flow inside the core consists of motions in which axial cylindrical annuli rotate rigidly about the Earth's axis of rotation. Then, for the 1969–85 time-span, the change in the core angular momentum is shown to balance the change in the mantle angular momentum. More... »

PAGES

353-356

References to SciGraph publications

Journal

TITLE

Nature

ISSUE

6171

VOLUME

333

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/333353a0

DOI

http://dx.doi.org/10.1038/333353a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1027368544


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