A model-Z geodynamo
- 1 July 1987
- journal article
- research article
- Published by Taylor & Francis in Geophysical & Astrophysical Fluid Dynamics
- Vol. 38 (4) , 327-349
- https://doi.org/10.1080/03091928708210113
Abstract
This paper describes a re-investigation of the geomagnetic dynamo model proposed by Braginsky (1978). This axisymmetric nonlinear model was dominated by Lorentz and Coriolis forces, and was maintained by a specified thermal wind and by a specifiedα-effect. Of particular interest were the strong indications of non-uniform behavior in the limit of small core-mantle coupling. The solution did not seem to approach a form independent of that coupling as had been suggested by Taylor (1963), but developed a model-Z structure as had been proposed by Braginsky (1975). In view of the significance of this result to dynamo theory, his integrations were repeated at higher resolution, with the results described in this paper. Apart from a few minor differences, Braginsky's findings were confirmed. Other integrations also gave dynamos of model-Z structure.Keywords
This publication has 6 references indexed in Scilit:
- Magnetic waves in the core of the earth. IIGeophysical & Astrophysical Fluid Dynamics, 1979
- On the nearly axially-symmetrical model of the hydromagnetic dynamo of the earthPhysics of the Earth and Planetary Interiors, 1976
- The macrodynamics of α-effect dynamos in rotating fluidsJournal of Fluid Mechanics, 1975
- Kinematic dynamo modelsPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1972
- The magneto-hydrodynamics of a rotating fluid and the earth’s dynamo problemProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963
- The Non-uniform Rotation of the Sun and its Magnetic FieldMonthly Notices of the Royal Astronomical Society, 1937