A Poincaré model for the Earth's fluid core.

Details A Poincaré model for the Earth's fluid core. A Poincaré model for the Earth's fluid core.

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gapfd..48....5a&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, Vol. 48, No. 1-3, p. 5 - 23

Physics

Fluid Dynamics

12

Earth Core: Models

Scientific paper

The superconducting-gravimeter data of Melchior and Ducarme (1986) has been interpreted as internal motion in the Earth's core by Aldridge and Lumb (1987) using a Poincaré model. Several low-order modes with periods of 13 - 16 hours have been tentatively identified in the core which is taken to be an incompressible, homogeneous fluid within a rigid, rotating container. The identification is based on asymptotic values of the frequencies which change slowly with time while the modes decay with an e-folding time of about 280 days. The slow change in frequency with time implies a small temporal variation in the rotating rate of the core. This mean flow in a nonlinear effect often observed in laboratory experiments designed to excite Poincaré modes. Laboratory work thus provides the link to extend the Poincaré model to include viscous and nonlinear effects in order to interpret the gravimetric observations as core modes.

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