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.

引用

页码：95 / 103

页数：9

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