Modeling Birkeland currents in the expanding/contracting polar cap paradigm
Modeling Birkeland currents in the expanding/contracting polar cap paradigm
复制标题
在扩张/收缩极冠范式中对伯克兰洋流进行建模
DOI：
10.1002/jgra.50393
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Milan
中科院分区：
文献类型：
--
作者：
S. Milan
我们提出了一个简单的数学模型的区域1和2 Birkeland电流系统强度不同的昼侧和夜侧磁重联率，与太阳风磁层电离层耦合的膨胀/收缩极冠范例一致。电流强度取决于跨极冠电位，这是昼侧和夜侧重连率的平均值。当磁层顶或磁尾重联占主导地位时，电流强度预计将在昼侧或夜侧达到最大值。电流强度还取决于电离层电导，合并间隙的宽度，电离层对流回流区的宽度，以及极冠的大小。
We present a simple mathematical model of the region 1 and 2 Birkeland current system intensities for differing dayside and nightside magnetic reconnection rates, consistent with the expanding/contracting polar cap paradigm of solar wind‐magnetosphere‐ionosphere coupling. The current intensities are shown to be dependent on the cross‐polar cap potential, which is the average of the dayside and nightside reconnection rates. Current intensities are expected to maximize on the dayside or the nightside when magnetopause or magnetotail reconnection dominates. Current intensities are also dependent on the ionospheric conductance, the width of the merging gaps, the width of the ionospheric convection return flow region, and on the size of the polar cap.