Continuous penetration of the interplanetary electric field to the equatorial ionosphere over eight hours during intense geomagnetic storms
Continuous penetration of the interplanetary electric field to the equatorial ionosphere over eight hours during intense geomagnetic storms
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DOI：
10.1029/2008ja013588
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发表时间：
2008-11
影响因子：
--
通讯作者：
Chaosong Huang
中科院分区：
文献类型：
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作者：
Chaosong Huang
[1]在强磁暴期间，行星际电场穿透低纬电离层，对电离层电动力学有重要影响。关键是要了解有多少行星际电场可以穿透到电离层，以及穿透电场可以存在多久。在这项研究中，我们提出了国防气象卫星计划（DMSP）卫星测量的赤道电离层离子垂直速度在黄昏部门在两个强烈的磁暴。我们发现，在磁暴主相期间的8-10小时内，黄昏赤道电离层电场与行星际电场近似成正比。穿透效率是相对恒定的，在整个时间间隔，是5%，黄昏在一个风暴的情况下。长时间的暴时穿透电场会引起电离层等离子体的显著重新分布。研究表明，在行星际磁场持续南移的情况下，磁暴活动加强时，在没有有效屏蔽的情况下，穿透电场可持续8-10小时。结果表明，在强磁暴的整个主相期间，行星际电场与黄昏赤道电离层呈线性耦合，这对于理解磁暴时电离层电场和电动力学具有重要意义。
[1] The interplanetary electric field penetrates to the low-latitude ionosphere and has significant influence on the ionospheric electrodynamics during intense geomagnetic storms. It is critical to understand how much of the interplanetary electric field can penetrate to the ionosphere and how long penetration electric fields can exist. In this study, we present the Defense Meteorological Satellite Program (DMSP) satellite measurements of the equatorial ionospheric ion vertical velocity in the dusk sector during two intense geomagnetic storms. We find that the equatorial ionospheric electric field at dusk is approximately proportional to the interplanetary electric field for 8-10 hours during the storm main phase. The penetration efficiency is relatively constant over the entire interval and is 5% at dusk in one storm case. The long-lasting storm-time penetration electric field causes significant redistribution of the ionospheric plasma. This study reveals that penetration electric fields can last for 8-10 hours without effective shielding when the magnetic storm activity is strengthening during continuous southward interplanetary magnetic field. The result implies that the interplanetary electric field is linearly coupled with the dusk equatorial ionosphere during the entire main phase of intense magnetic storms, which is very important for understanding the storm-time ionospheric electric field and electrodynamics.