Improved electrodynamic modeling of an omega band and analysis of its current system
Improved electrodynamic modeling of an omega band and analysis of its current system
复制标题
改进了欧米茄带的电动力学模型及其当前系统的分析
DOI：
10.1029/95ja03155
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发表时间：
1996
影响因子：
--
通讯作者：
O. Amm
中科院分区：
文献类型：
--
作者：
O. Amm
我们通过采用非均匀的霍尔与Pedersen电导比的空间分布而不是使用一个常量来改进以前的欧米伽带的电动力学模型。根据我们的模型对电流系统的分析表明，在分离背景西向电喷流后，欧米伽带电流主要由绕在极光舌部集中向上的场向电流周围的霍尔电流组成。然而，向上的场向电流在舌头中心附近呈现出接近圆形的形状，并且几乎直接在舌头中心消失。同样强大的向下磁场对准的电流也不见了。此外，在舌尖的西侧，我们注意到一条大致西北-东南排列的考林海峡。它的电流主要是造成磁图上的尖峰状D峰和地面上D和Z纵向剖面的普遍不对称性的原因。该通道中霍尔电导的额外增强进一步改善了计算的和测量的地磁扰动剖面之间的一致性。
We improve a previous electrodynamic model of an omega band by applying a nonuniform spatial distribution of the Hall to Pedersen conductance ratio instead of using a constant value. The analysis of the current system due to our model reveals that after separating the background westward electrojet off, the omega band currents mainly consist of Hall currents circulating around concentrated upward field-aligned currents in the auroral tongue. However, the upward field-aligned currents exhibit a nearly circular configuration around the center of the tongue and almost vanish directly in the center. Equally strong downward field-aligned currents are missing. Additionally, at the western flank of the tongue we notice an about northwest–southeast aligned Cowling channel. Its currents are mainly responsible for the spike-like D peak in magnetograms and for the general asymmetry in D and Z longitudinal profiles on the ground. An additional enhancement of the Hall conductance in this channel further improves the agreement between calculated and measured ground magnetic disturbance profiles.