Physics – Geophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975geoj...43..253a&link_type=abstract
Geophysical Journal, vol. 43, no. 1, Oct. 1975, p. 253-268.
Physics
Geophysics
4
Dynamo Theory, Earth Core, Earth Mantle, Geomagnetism, Magnetohydrodynamic Waves, Coupled Modes, Earth Rotation, Electromagnetic Coupling, Geophysics, Periodic Variations
Scientific paper
Even the most sophisticated calculations to date of electromagnetic coupling between the earth's core and mantle have been qualified by the possibility, recently emphasized by a number of authors, that the coupling might be significantly enhanced by very short-period (less than 4 years) magnetic fluctuations in the core. It is extremely difficult to evaluate with any certainty the effects of such high-frequency components, since they would be screened from observation at the earth's surface by the skin-effect in the mantle. Nevertheless by investigating here a class of very long-period hydromagnetic waves that would inevitably accompany them, and the consequent effect that they would have on the earth's magnetic field and rotation rate, we find evidence to justify the neglect of such high-frequency coupling, unless the scale of the fluctuations is very small indeed, about 100 km or so, and the amplitude correspondingly large, about 150 gauss or more.
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