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Precession driven dynamos
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DOI：10.1063/1.1852576.png)
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Abstract
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The dynamo effect is demonstrated numerically in precession driven flow in a spherical container. Both laminar as well as unstable flows act as dynamos. At low Ekman numbers in unstable flows, the dynamo mechanism relies predominantly on the components of the flow excited by instabilities. All calculations are performed in a frame of reference attached to the boundaries. In this frame, the rotation axis of the fluid executes a periodic motion with a period equal to the rotation period of the boundaries, whereas the magnetic dipole moment undergoes slower variations interrupted by reversals. (C) 2005 American Institute of Physics.
Keywords:
SPHEROIDAL CAVITY
FLUID-FLOW
LIQUID
INSTABILITIES
GEODYNAMO
MOTION
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