Synchronism of variations in the main geomagnetic field and earth rotation velocity fluctuations

被引：0
作者：
I. M. Demina
P. B. Batalov
T. Yu. Koroleva
机构：
[1] Russian Academy of Sciences,Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, St. Petersburg Branch
来源：
Geomagnetism and Aeronomy | 2013年 / 53卷
关键词：
Phase Shift; Dispersion Curve; Cross Correlation Function; Harmonic Component; Secular Variation;
D O I：
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中图分类号：
学科分类号：
摘要：
Variations in the value of the source magnetic moment, responsible for the dipole component of the main geomagnetic field, and Earth rotation velocity fluctuations have been studied comparatively. Three quasi-harmonic components with close periods, for which their own phase shifts were obtained, have been detected in time series of the analyzed processes. The mantle conductivity effect on these shifts has been studied in the scope of a one-layer model; for this purpose, the amplitude-phase characteristic of the mantle as a filter has been constructed. The mantle conductivity has been estimated (σ = 270 ± 20 S m−1) on the assumption that the phase shift mainly depends on the mantle effect. It has been assumed that the variations in the time series of the analyzed processes are almost cophased and can be caused by one external factor, e.g., tides.
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页码：247 / 256
页数：9
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