Geomagnetic storms and electric fields in the equatorial ionosphere
Geomagnetic storms and electric fields in the equatorial ionosphere
复制标题
DOI：
10.1038/268422a0
复制
发表时间：
1977-08
期刊：
影响因子：
64.8
通讯作者：
R. Rastogi
中科院分区：
文献类型：
--
作者：
R. Rastogi
地磁暴期间在地面观测到的地磁场的巨大变化通常归因于太阳耀斑期间抛出的太阳等离子体到达后发生的各种磁层变化。本文利用地磁暴期间赤道电场的直接测量表明，赤道附近观测到的电场的大幅度下降是由于赤道电喷流的反转所致。这一事件是由太阳风与行星际磁场相互作用产生的向西向赤道电离层施加的附加电场引起的。
LARGE variations of the geomagnetic field observed at ground level during a geomagnetic storm are generally attributed to various magnetospheric changes following the arrival of the solar plasma ejected during the solar flare. Using the direct measurements of equatorial electric field during a geomagnetic storm, it is shown here that the large decrease in the field observed near the dip equator is due to the reversal of the equatorial electrojet current. This event is caused by the imposition of an additional westward electric field on the equatorial ionosphere which was originated by the interaction of solar wind with the interplanetary magnetic field.