Dynamic Response of Ionospheric Plasma Density to the Geomagnetic Storm of 22‐23 June 2015
Dynamic Response of Ionospheric Plasma Density to the Geomagnetic Storm of 22‐23 June 2015
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DOI：
10.1029/2018ja026172
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发表时间：
2019-08
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影响因子：
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通讯作者：
C. Ngwira;J. Habarulema;E. Astafyeva;E. Yizengaw;O. Jonah;G. Crowley;A. Gisler;V. Coffey
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文献类型：
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作者：
C. Ngwira;J. Habarulema;E. Astafyeva;E. Yizengaw;O. Jonah;G. Crowley;A. Gisler;V. Coffey
2015年6月21日至22日，三次连续的行星际冲击撞击地球的磁层。6月22日18时36分，第三次地震发生后不久，一场异常的突然风暴开始，振幅为Δ SYM-H = 106 nT，一场大磁暴开始。在本研究中，一个多仪器的方法，包括观测，数据分析和建模被用来检查全球电离层响应。结果表明，增强的风暴时间过程产生了主要的总电子含量（TEC）的变化，在不同的纬度，纬度和风暴的阶段。对TEC观测结果的仔细检查揭示了强烈的纵向和半球形不对称性。此外，在TEC数据中检测到多个向赤道和向极传播的电离层扰动（TID）。向赤道传播的TID与热层-电离层-电动力学大气环流模式模拟的垂直中性风相一致;然而，向极传播的TID在模式中没有再现。我们发现，驱动过程的组合，包括增强高纬度注入，迅速渗透电场，扰动发电机效应，中性风和成分变化在风暴的不同阶段起作用。
On 21–22 June 2015, three consecutive interplanetary shocks slammed into the Earth's magnetosphere. Immediately after the third shock at 18:36 UT on 22 June, marked by an exceptional sudden storm commencement with an amplitude of ΔSYM‐H = ∼106 nT, a major geomagnetic storm commenced. In the present study, a multi‐instrument approach comprising observations, data analysis, and modeling is used to examine the global ionospheric response. Results show that enhanced storm time processes produced major total electron content (TEC) variations at different latitudes, longitudes, and phases of the storm. A closer inspection of the TEC observations reveals strong longitudinal and hemispherical asymmetry. In addition, multiple equatorward and poleward propagating traveling ionospheric disturbances (TIDs) were detected in the TEC data. Equatorward propagating TIDs are consistent with vertical neutral winds simulated from Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model; however, poleward TIDs were not reproduced in the model. We find that a combination of driving processes including enhanced high‐latitude injection, prompt penetration electric fields, disturbance dynamo effect, neutral winds, and composition changes were acting at different stages of the storm.