Extreme Birkeland Currents Are More Likely During Geomagnetic Storms on the Dayside of the Earth

Extreme Birkeland Currents Are More Likely During Geomagnetic Storms on the Dayside of the Earth
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在地球白天的地磁风暴期间更有可能出现极端伯克兰电流

DOI:
10.1029/2023ja031946
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发表时间:
2023
期刊:
Space Physics
影响因子:
--
通讯作者:
Coxon J
Coxon J
中科院分区:
--
文献类型:
--
作者:
Coxon J

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我们研究了由活动磁层和行星电动力学响应实验测量的大规模伯克兰电流的统计分布,首次在地磁活动的四个独特类别中进行:安静时间,风暴时间,安静时间亚暴和风暴时间亚暴。采用一种新的方法将数据分类到这四个类别中的一个,并为未来的研究提供了分类。平均电流密度在亚暴期间最大,其标准差在磁暴期间最大。亚暴期间更有可能出现高于低阈值的电流密度,但在地磁暴期间更有可能出现极端电流,这与地磁暴代表平静时期可变性增强的时期的范例一致。我们证明,极端电流是最有可能在区域2电流在磁暴。这在区域1电流通常较大的当前系统的范例中是出乎意料的。
We examine the statistical distribution of large‐scale Birkeland currents measured by the Active Magnetosphere and Planetary Electrodynamics Response Experiment in four unique categories of geomagnetic activity for the first time: quiet times, storm times, quiet‐time substorms, and storm‐time substorms. A novel method is employed to sort data into one of these four categories, and the categorizations are provided for future research. The mean current density is largest during substorms and its standard deviation is largest during geomagnetic storms. Current densities which are above a low threshold are more likely during substorms, but extreme currents are far more likely during geomagnetic storms, consistent with a paradigm in which geomagnetic storms represent periods of enhanced variability over quiet times. We demonstrate that extreme currents are most likely to flow within the Region 2 current during geomagnetic storms. This is unexpected in a paradigm of the current systems in which Region 1 current is generally larger.
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发表时间: 2020-12
期刊: Journal of Geophysical Research: Space Physics
影响因子: --
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