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Free core nutation and geomagnetic jerks

机译:自由铁心章动和地磁冲击

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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.
机译:自由核章动(FCN)的变化与地球流体核心和核心—地幔耦合的不同过程有关。通常,相同的过程会引起地磁场(GMF)的变化,尤其是地磁冲击(GMJ)的变化,这是GMF长期变化的快速变化。因此,联合研究FCN和GMF的变化可以阐明地球的内部和动力学。在本文中,我们研究了从VLBI观测得到的FCN振幅和相位变化。 FCN振幅和相位变化的时期与GMJ时期的比较表明,观察到的FCN振幅和相位变化的极端与GMJ时期密切相关。特别是,在GMJ之后一到三年,FCN振幅开始增长。因此,将导致GMJ的过程假定为FCN激发的来源。

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