Low Latitude Ionospheric TEC Oscillations Associated With Periodic Changes in IMF Bz Polarity
Low Latitude Ionospheric TEC Oscillations Associated With Periodic Changes in IMF Bz Polarity
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DOI：
10.1029/2019gl084428
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发表时间：
2019-08
影响因子：
5.2
通讯作者：
Guozhu Li;B. Ning;Xiukuan Zhao;Wenjie Sun;L. Hu;Haiyong Xie;Kangkang Liu;K. Ajith
中科院分区：
文献类型：
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作者：
Guozhu Li;B. Ning;Xiukuan Zhao;Wenjie Sun;L. Hu;Haiyong Xie;Kangkang Liu;K. Ajith
最近部署了东亚/东南亚不规则性和闪烁电离层观测网。利用北斗地球同步卫星网络沿110°E和23°N相交的两个接收链的电离层总电子含量和三亚(18.3°N，109.6°E)便携式数字电离层探空仪的多普勒速度测量，首次观测到了2018年4月20日地磁风暴主相之后东亚/东南亚地区在较大经度范围内同步发生的低纬总电子含量振荡。TEC与多普勒速度和行星际磁场(IMF)BZ分量的比较表明，TEC的周期性增强与F区等离子体向下漂移和IMF BZ南转有关。结果表明，IMF BZ的准周期南转可以产生多个短暂的西向瞬变穿透电场，这些电场有助于在大经度范围内同时驱动夜间低纬TEC振荡。
An Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia was recently deployed. Using ionospheric total electron content (TEC) from the two crossed Beidou geostationary satellite receiver chains of the network along 110°E and 23°N and Doppler velocity measurements from the Sanya (18.3°N, 109.6°E) portable digital ionosonde, we report first observations of low latitude TEC oscillations synchronized over a wide longitude range in East/Southeast Asia, which occur at nighttime, after the main phase of the geomagnetic storm on 20 April 2018. A comparison among TEC and Doppler velocity and interplanetary magnetic field (IMF) Bz component shows that the periodic TEC enhancements correlate with F region downward plasma drifts and IMF Bz southward turnings. The results suggest that the quasiperiodic southward turnings of IMF Bz could produce multiple short‐lived westward prompt penetration electric fields, which contribute to driving the nighttime low latitude TEC oscillations simultaneously over the wide longitude range.