Chandler wobble and geomagnetic jerks

Details Chandler wobble and geomagnetic jerks Chandler wobble and geomagnetic jerks

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..124...95b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 124, Issue 1-2, p. 95-103.

Physics

12

Scientific paper

Some features of the polar motion may be due to core-mantle coupling, but no convincing quantitative mechanism has yet been proposed. Considering phase jumps in the Chandler wobble and noticing their correlation with geomagnetic jerks [J. Geophys. Res. 103 (B11) (1998) 27069-27089], we suggest that the instability of a layer at the top of the core and its downward propagation induce a step in the core-mantle torque strong enough to explain phase jumps in the Chandler wobble. The surface magnetic signature of this instability is comparable with the typical evolution of the geomagnetic field during a jerk.

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