Principal component analysis of Birkeland currents determined by the Active Magnetosphere and Planetary Electrodynamics Response Experiment
Principal component analysis of Birkeland currents determined by the Active Magnetosphere and Planetary Electrodynamics Response Experiment
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活性磁层和行星电动力学响应实验确定的伯克兰电流的主成分分析
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Anderson
中科院分区：
文献类型：
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作者：
S. Milan;S. Milan;J. Carter;H. Korth;B. Anderson
主成分分析是在主动磁层和行星电动力学响应实验的Birkeland或场对准电流（FAC）测量上进行的。主成分分析（PCA）确定了地磁活动的不同方面在地磁活动中一致响应的模式。区域1和2电流系统显示为电流的最可重复的特征，其次是与新重新连接的磁力线上的磁张力相关的尖端电流。尖峰电流受季节的强烈调节，表明它们的强度受磁场线底部电离层电导的调节。主成分分析并没有识别出明显的亚暴电流楔型特征。相反，对与亚暴有关的电流进行的年代叠加分析表明，响应模式不是单一的，而是不同模式的复杂而微妙的混合。
Principal component analysis is performed on Birkeland or field‐aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics Response Experiment. Principal component analysis (PCA) identifies the patterns in the FACs that respond coherently to different aspects of geomagnetic activity. The regions 1 and 2 current system is shown to be the most reproducible feature of the currents, followed by cusp currents associated with magnetic tension forces on newly reconnected field lines. The cusp currents are strongly modulated by season, indicating that their strength is regulated by the ionospheric conductance at the foot of the field lines. PCA does not identify a pattern that is clearly characteristic of a substorm current wedge. Rather, a superposed epoch analysis of the currents associated with substorms demonstrates that there is not a single mode of response, but a complicated and subtle mixture of different patterns.
DOI：
10.1002/2014ja020500
发表时间：
2014-12
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
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作者：
J. Coxon;S. Milan;Lasse Boy Novock Clausen;Brian J. Anderson;H. Korth
通讯作者：
J. Coxon;S. Milan;Lasse Boy Novock Clausen;Brian J. Anderson;H. Korth