Free core nutation and geomagnetic jerks

被引：36
作者：
Malkin, Z. [1 ,2 ]
机构：
[1] Pulkovo Observ, St Petersburg 196140, Russia
[2] St Petersburg State Univ, St Petersburg 198504, Russia
来源：
JOURNAL OF GEODYNAMICS | 2013年 / 72卷
关键词：
Earth's rotation; Free core nutation; Geomagnetic field; Geomagnetic jerks; VLBI; SECULAR VARIATION; CHANDLER-WOBBLE; WAVELET ANALYSIS; PHASE JUMPS; EARTH; PARAMETERS; VLBI; EXCITATION; PRECESSION;
D O I：
10.1016/j.jog.2013.06.001
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：
Variations in free core nutation (FCN) are associated with different processes in the Earth's fluid core and core-mantle coupling. The same processes are generally caused the variations in the geomagnetic field (GMF) particularly the geomagnetic jerks (GMJs), which are rapid changes in GMF secular variations. Therefore, the joint investigation of variations in FCN and GMF can elucidate the Earth's interior and dynamics. In this paper, we investigated the FCN amplitude and phase variations derived from VLBI observations. Comparison of the epochs of the changes in the FCN amplitude and phase with the epochs of the GMJs indicated that the observed extremes in the FCN amplitude and phase variations were closely related to the GMJ epochs. In particular, the FCN amplitude begins to grow one to three years after the GMJs. Thus, processes that cause GMJs are assumed as sources of FCN excitation. (C) 2013 Elsevier Ltd. All rights reserved.
引用
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页码：53 / 58
页数：6
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