2015 年地磁暴期间中低纬度子午线链的地磁扰动

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Xinxin Ma, Zhan Lin, Xizheng Wang, Qi Li, Suqin Zhang
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引用次数: 0

摘要

本文利用地磁中低纬度的子午链数据,对2015年不同强度的地磁暴期间地面观测到的地磁扰动进行了分析。地面观测记录叠加了不同类型的空间电流系统和噪声干扰。具有不连续性和不规则性变化的地磁扰动难以识别和区分。我们提出了一种用于重建地磁水平干扰信号的变模分解(VMD)算法。我们利用 VMD 算法将地磁信号分解为地磁扰动信号、昼夜变化信号和噪声扰动信号。我们选择了本征模态函数(IMF)来形成重构信号,它代表了地磁暴期间的地磁扰动。我们研究了在中低纬度不同地磁暴强度和不同季节的地磁暴主阶段,从重建信号中得到的(H)分量幅度减小的情况。在不同强度和季节的地磁暴期间,随着地磁纬度余弦的变化,\(H \)分量扰动的梯度变化的最大值出现在磁纬度 30°N附近。中低纬度过渡带的离子结构变化可能是主要原因。该结果为地磁暴期间电离层与磁层之间复杂的耦合关系提供了参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Geomagnetic disturbance of the meridian chain at mid and low latitudes during 2015 geomagnetic storms

Geomagnetic disturbance of the meridian chain at mid and low latitudes during 2015 geomagnetic storms

Geomagnetic disturbance of the meridian chain at mid and low latitudes during 2015 geomagnetic storms

This paper presented an analysis of geomagnetic disturbance observed on the ground during geomagnetic storms with different intensities in 2015 using the meridian chain data at geomagnetic mid and low latitudes. Ground observation records superimpose varying types of space-current system and noise interference. Geomagnetic disturbance with variation of discontinuity and irregularities are difficult to identify and distinguish. We proposed a variational mode decomposition (VMD) algorithm for reconstructing geomagnetic horizontal (\(H\)) disturbance signals. We decomposed the geomagnetic signals into geomagnetic disturbance signals, diurnal variation signals, and noise disturbance signals using the VMD algorithm. Intrinsic mode functions (IMFs) were selected to form the reconstructed signal, which represented a geomagnetic disturbance during a geomagnetic storm. We investigated the decreased amplitude of \(H\) component obtained from the reconstructed signals during main phase of geomagnetic storms with different geomagnetic storms intensities and seasons at mid and low latitudes. The maximum values of gradient variation of \(H \) component disturbance with geomagnetic latitude cosine are near magnetic latitude 30°N during geomagnetic storms with different intensities and seasons. Ionopheric structural changes in the low-to-mid latitude transition zone maybe the primary cause. The result provides a reference for the complex coupling relationship between the ionosphere and magnetosphere during geomagnetic storms.

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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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