Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41...73r&link_type=abstract
(American Geophysical Union, Spring Meeting, Cincinnati, OH, May 17, 1984) Physics of the Earth and Planetary Interiors (ISSN 00
Physics
2
Dynamo Theory, Geodynamics, Geomagnetism, Secular Variations, Coupling, Earth Core, Earth Mantle, Earth Rotation, Polar Wandering (Geology)
Scientific paper
The discovery of the geomagnetic jerk of 1969 has again focussed attention on short time scale phenomena in the core. The irregular fluctuations in the length of the day and the excitation of the Chandler wobble have characteristics strongly suggesting 'impulsive' torques on the mantle. These are believed to result from electromagnetic phenomena associated with disturbances in the core dynamo, the time scales of which depend on Alfven wves. Search for correlations between short lived magnetic phenomena arising in the core and similar short term geodynamic phenomena have yielded some interesting results. Future satellite surveys of the geomagnetic field need to be designed to distinguish such short term core phenomena from external magnetospheric ones. Future geomagnetic charts of the world require much better understanding of discontinuities in the first and second derivatives of the geomagnetic field elements.
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