Response of the equatorial ionosphere to the geomagnetic DP 2 current system
Response of the equatorial ionosphere to the geomagnetic DP 2 current system
复制标题
赤道电离层对地磁DP 2 电流系统的响应
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
E. R. Paula
中科院分区：
文献类型：
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作者：
E. Yizengaw;M. Moldwin;E. Zesta;M. Magoun;R. Pradipta;C. M. Biouele;A. Rabiu;O. Obrou;Z. Bamba;E. R. Paula
利用地面多仪器观测研究了赤道电离层对磁层起源DP 2电流系统波动的响应。太阳风与磁层的相互作用产生对流电场，对流电场可以穿透电离层，产生DP2电流系统。准周期DP 2电流系统，波动相干的行星际磁场（IMF）Bz的波动，几乎瞬间穿透到向阳面赤道区在所有的电介质和调制的电动力学，管理赤道密度分布。在本文中，我们使用高纬度和赤道地区的磁强计，证明了准周期DP 2电流系统穿透赤道，并导致昼侧赤道电急流（EEJ）和独立测量的电离层漂移速度与高纬度DP 2电流以及IMF Bz分量相干波动。同时，雷达观测表明，电离层密度层上下移动，导致密度上下波动与EEJ和IMF Bz相干。
The response of equatorial ionosphere to the magnetospheric origin DP 2 current system fluctuations is examined using ground‐based multiinstrument observations. The interaction between the solar wind and magnetosphere generates a convection electric field that can penetrate to the ionosphere and cause the DP 2 current system. The quasiperiodic DP 2 current system, which fluctuates coherently with fluctuations of the interplanetary magnetic field (IMF) Bz, penetrates nearly instantaneously to the dayside equatorial region at all longitudes and modulates the electrodynamics that governs the equatorial density distributions. In this paper, using magnetometers at high and equatorial latitudes, we demonstrate that the quasiperiodic DP 2 current system penetrates to the equator and causes the dayside equatorial electrojet (EEJ) and the independently measured ionospheric drift velocity to fluctuate coherently with the high‐latitude DP 2 current as well as with the IMF Bz component. At the same time, radar observations show that the ionospheric density layers move up and down, causing the density to fluctuate up and down coherently with the EEJ and IMF Bz.