Polarization and wave form of magnetic pulsations below pulsating auroras: magnetic effects of electric currents induced in an ionization tail of a moving auroral patch
Polarization and wave form of magnetic pulsations below pulsating auroras: magnetic effects of electric currents induced in an ionization tail of a moving auroral patch
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脉动极光下方磁脉动的极化和波形：移动极光斑块电离尾部感应电流的磁效应
DOI：
10.5636/jgg.37.65
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
K. Hayashi
中科院分区：
文献类型：
--
作者：
T. Oguti;K. Hayashi
研究了在流动极光、传播极光和一大群脉动极光下在地面多个台站观测到的地磁脉动的极化和波形，并与模型极光斑块及其周围的电流系统的磁效应进行了比较。结论是，不同地面点的磁脉动的极化和波形都可以用电流、场向对向电流和双涡电流来解释，这些电流是在运动的极光斑块后面的电离层的电离尾部与对流电场一起感应的，并随着斑块的迁移而移动。由于黎明极光区的不规则磁脉动往往在白天被极光区PC-3连续跟随，这一结果强烈地表明，极光区PC-3可能也是由电离层局部电导率波动引起的，至少部分是由相同的机制引起的。
Polarization and wave form of geomagnetic pulsations observed at multiple stations on the ground below a streaming aurora, a propagating aurora and a large cluster of pulsating auroral patches were examined and compared with magnetic effects of current systems in and around model auroral patches. Conclusion is that both the polarization and the wave form of magnetic pulsations at various ground points are fully accounted for in terms of electric currents, a field-aligned pair current and a twin-vortex current, which are induced in an ionization tail in the ionosphere behind a moving auroral patch in conjunction with the convection electric field, and move following the patch migration. Since the irregular magnetic pulsation in the dawn auroral zone often tends to be continuously followed by auroral zone pc-3 in the daytime, the result strongly suggests that the auroral zone pc-3 may, some portion at least, also be caused by the same mechanism by the local fluctuations in conductivity in the ionosphere.