Temporal and Spatial Development of Global Birkeland Currents
Temporal and Spatial Development of Global Birkeland Currents
复制标题
全球伯克兰洋流的时空发展
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Vines
中科院分区：
文献类型：
--
作者：
B. Anderson;C. Olson;H. Korth;R. Barnes;C. Waters;S. Vines
大规模Birkeland电流的发展是使用主动磁层和行星电动力学响应实验（AMPERE）进行研究的，该实验在10分钟的时间尺度上连续测量全球Birkeland电流。积分电流被用来确定发作至少1 MA之前，持续至少3小时的静止期。区域1电流不完全形成没有区域2。相反，它们一起发展，首先在白天，然后在黑夜，最后，它们在所有当地时间填充和加强，形成名义统计模式。太阳风电场和行星际磁场的方向指示的磁层强迫的增强密切相关的发作。夜侧发作对应于AE指数中反映的极光电射流的增强;它们相对于昼侧电流的增加延迟约40分钟，并且比昼侧电流的增加快2.8倍。在夜侧开始后，伯克兰电流向黎明和黄昏扩展，并与昼侧电流合并，同时在所有当地时间都加强。昼侧电流的模式取决于行星际磁场BY的符号。正、负BY的夜侧电流分布是相同的，并显示出与BY的符号无关的Harang不连续性。主要的发展和强化的Birkeland电流发生后，在所有当地时间与约75%的总电流，区域1和2，出现后，夜侧发病。
The development of large‐scale Birkeland currents is examined using the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE), which measures global Birkeland currents continuously on 10‐min time scales. The integrated current was used to identify onsets of at least 1 MA preceded by periods of quiescence lasting at least 3 hr. The Region 1 currents do not fully form without Region 2. Rather, they develop together, first on the dayside, then on the nightside, and lastly, they fill in and intensify at all local times to form the nominal statistical pattern. The onsets are closely correlated with enhancements of magnetospheric forcing as indicated by the solar wind electric field and the orientation of the interplanetary magnetic field. Nightside onsets correspond to intensifications of the auroral electrojet as reflected in the AE index; they are delayed by ~40 min relative to the increase of the dayside current and are 2.8 times more rapid than the dayside current increase. After nightside onset, Birkeland currents expand toward dawn and dusk and merge with the dayside currents while also intensifying at all local times. The dayside current pattern depends on the sign of the interplanetary magnetic field BY. The nightside current distributions are the same for positive and negative BY and display a Harang discontinuity independent of the sign of BY. The predominant development and intensification of Birkeland currents occur after nightside onset at all local times with roughly 75% of the total current, both Regions 1 and 2, appearing after nightside onset.
亚暴期间的伯克兰洋流：1 区和 2 区洋流爆发后增强的统计证据以及极光变暗的局部特征
DOI：
10.1002/2017ja023967
发表时间：
2017
期刊：
Space Physics
影响因子：
--
作者：
Coxon J
通讯作者：
Coxon J
DOI：
10.1002/2014ja020500
发表时间：
2014-12
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
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