Irregularities in the Shift of Earth’s Geographical Pole and Jerks in the Geomagnetic Field

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
G. S. Kurbasova, A. E. Volvach
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Abstract

The results of an analysis of some irregularities in a series of coordinates of the shift in the geographic North Pole along Earth’s surface are presented in order to establish a temporal relationship between their appearance and some global jerks in the geomagnetic field. The calculations used average daily data from the IERS service on movement of the North Pole from 1962 to 2021, as well as information on global jerks in the geomagnetic field at all magnetic observatories on the globe. To identify and analyze irregularities in the movement of the pole along the Earth’s surface, the following methods were used: Fourier methods and wavelet analysis of time series, methods for determining the threshold of a fixed shape and minimax in the procedure for analyzing non-Gaussian noise, methods of phase and pseudophase space, as well as the stroboscopic method of constructing the Poincaré map. Analysis of local Fourier spectra and wavelet spectra reveal irregularities in the shift of the North Pole along the Earth’s surface in the following time intervals: 1967.04.09–1967.11.30, 1974.03.29–1974.09.12, 2005.11.03–2006.03.07, comparable to the appearance of global jerks in 1969, 1978 and local jerks in 2005. It is believed that the changes in energy that caused short-term deviations of the shift in the pole’s trajectory and return to the previous trajectory at cusp points are associated with singularities in the interaction of oscillations in Earth’s rotational and translational motion in the Solar System. The time of the appearance of irregularities on the graphs of the polar shift along the Earth’s surface in 1967 and 1974 is ahead of the time of the appearance of global jerks in the geomagnetic field.

Abstract Image

Abstract Image

地球地理极移动的不规则性和地磁场的颠簸
摘要 介绍了对地球表面地理北极移动的一系列坐标中的一些不规则现象的分析结果,以确定这些现象的出现与地磁场中的一些全球偏移之间的时间关系。计算中使用了国际地球资源卫星(IERS)提供的 1962 年至 2021 年北极移动的日均数据,以及全球所有磁性观测站的地磁场全球偏移信息。为了识别和分析北极沿地球表面运动的不规则性,使用了以下方法:时间序列的傅立叶方法和小波分析、确定固定形状阈值的方法和分析非高斯噪声程序中的最小值、相位和伪相位空间方法以及构建波恩卡莱图的频闪方法。对局部傅里叶频谱和小波频谱的分析表明,在以下时间间隔内,北极沿地球表面的移动存在不规则性:1967.04.09-1967.11.30、1974.03.29-1974.09.12、2005.11.03-2006.03.07,这与 1969 年、1978 年出现的全球抽动和 2005 年出现的局部抽动相当。据认为,造成极点轨迹短期偏移并在尖点处恢复到先前轨迹的能量变化,与太阳系中地球自转和平移运动振荡相互作用的奇点有关。1967 年和 1974 年沿地球表面的极移曲线图上出现不规则现象的时间,要早于地磁场中出现全球抽动的时间。
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来源期刊
Geomagnetism and Aeronomy
Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science
CiteScore
1.30
自引率
33.30%
发文量
65
审稿时长
4-8 weeks
期刊介绍: Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.
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