dynamo theory


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dynamo theory

[′dī·nə‚mō ‚thē·ə·rē]
(geophysics)
The hypothesis which explains the regular daily variations in the earth's magnetic field in terms of electrical currents in the lower ionosphere, generated by tidal motions of the ionized air across the earth's magnetic field.
References in periodicals archive ?
That is, the emphasis is given more to the instabilities (magnetorotational, Tayler, etc) rather than dynamo theory.
Topics include foundations of dynamo theory, including self-excited dynamo action, nonlinearity and saturation, and dynamics of rotating fluids; natural dynamos and models, including the geodynamo, planetary dynamos, stellar dynamos, and galactic dynamos; and results of recent experiments.
Called the dynamo theory, it evokes a comparison between a planet's magnetic axis and the shaft of an electric motor.
Because sunspots have been successfullymodeled by a dynamo theory for the sun, Olson suspects that this theory may bear fruit for the earth as well.