The stochastic excitation of reversals in simple dynamos

Details The stochastic excitation of reversals in simple dynamos The stochastic excitation of reversals in simple dynamos

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...42..143c&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 42, Feb. 28, 1986, p. 143-153.

Physics

20

Dynamo Theory, Excitation, Stochastic Processes, Chaos, Paleomagnetism, Random Processes, Torque

Scientific paper

A study examining whether the behavior of simple alpha-omega disk dynamo models can be attributed to inherent chaos or to external stimulation by a random component, is presented. The addition of Gaussian, flicker, and brown noise stochastic excitations are shown to enrich the field evolution and lead to realistic palaeomagnetic behavior. The presence of noise processes in the actual fluid core suggests a flicker noise stimulation of the dynamo. The presence of noise in the dynamo process is indicated by the absence of a linear oscillation in field intensity between reversals, or by the absence of an increase in amplitude of this oscillation prior to a reversal. The addition of a random component to the helicity driving function of the alpha-squared dynamo process illustrates the connection of helicity with thermodynamics in the core. Various types of reversal are demonstrated.

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