Transmission of polar electric fields to the Equator
Transmission of polar electric fields to the Equator
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DOI：
10.1038/273650a0
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发表时间：
1978-06
期刊：
影响因子：
64.8
通讯作者：
T. Kikuchi;T. Araki;H. Maéda;K. Maekawa
中科院分区：
文献类型：
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作者：
T. Kikuchi;T. Araki;H. Maéda;K. Maekawa
在高纬度和赤道地区同时观测到几种地磁变化。这些是亚暴或DP-1变化，Spqor DP-2变化，某些脉动，以及SSC和SI的DS部分。Araki1分析了出现在高纬度和赤道地区的Sc*的初步反向冲量的关系，发现它们在这两个地区的出现具有很好的相关性，几乎同时发生，并且波形非常相似。从这些地磁变化的特征来看，似乎是磁层施加在极地电离层的水平电场对这些地磁变化的赤道部分有很大的贡献。这个电场是由磁层中的大尺度动态过程产生的，如行星际激波的突然压缩或磁层对流的变化，其方向大约是东西(黎明-黄昏)2。为了阐明极地电场的瞬时水平传输的机制，我们分析了电离层对突然施加的电场的响应。
SEVERAL kinds of geomagnetic variations are observed simultaneously at high latitudes and in the equatorial region. These are substorms or DP-1 variations,Spqor DP-2 variations, some kinds of pulsations, and the DS-part of SSC and SI. Araki1analysed the relationship of the preliminary reverse impulse of SC*occurring in the high-latitude and the equatorial regions and found that their occurrence in both regions is well correlated, almost simultaneous, and that the waveforms are very similar. From the characteristics of these geomagnetic variations, it seems that a horizontal electric field impressed in the polar ionosphere from the magnetosphere greatly contributes to the equatorial part of these geomagnetic variations. This electric field is generated by large scale dynamic processes in the magnetosphere such as a sudden compression by an interplanetary shock wave or a change of the magnetospheric convection, and its direction will be approximately east–west (dawn–dusk)2. To clarify the mechanism of the instantaneous horizontal transmission of the polar electric field, we have analysed the response of the ionosphere to a suddenly impressed electric field.