Chandler wobble and geomagnetic jerks

被引：21
|
作者：
Bellanger, E [1 ]
Le Mouël, JL [1 ]
Mandea, M [1 ]
Labrosse, S [1 ]
机构：
[1] Inst Phys Globe, Lab Geomagnetism, F-75252 Paris 05, France
来源：
PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 2001年 / 124卷 / 1-2期
关键词：
geomagnetic jerks; Chandler wobble; earth's core; core-mantle coupling;
D O I：
10.1016/S0031-9201(01)00188-1
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
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. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：95 / 103
页数：9
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