Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock
Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock
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DOI：
10.1029/2022ja030565
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发表时间：
2023-03
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通讯作者：
Jianjun Liu;S. Chakraborty;Xiangcai Chen;Zhiwei Wang;Fang He;Zejun Hu;E. Liu;Amarjargal Bat‐Erdene;Desheng Han;J. Ruohoniemi;J. Baker;Huigen Yang;Qiu‐gang Zong;Hongqiao Hu
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作者：
Jianjun Liu;S. Chakraborty;Xiangcai Chen;Zhiwei Wang;Fang He;Zejun Hu;E. Liu;Amarjargal Bat‐Erdene;Desheng Han;J. Ruohoniemi;J. Baker;Huigen Yang;Qiu‐gang Zong;Hongqiao Hu
行星际（IP）冲击驱动的地球磁层突然压缩会在极地电离层中产生电磁干扰。几项研究使用全天摄像机和雷达研究了IP冲击对磁层-电离层耦合系统的影响。在这项研究中，我们研究了 2012 年 6 月 16 日 IP 冲击压缩后极地电离层的响应和驱动因素。我们观察了等离子体的垂直漂移和并发水平运动。位于南极中山站（ZHO）的数字观测仪的观测显示电离层厚E区电离以及F区相关的垂直向下等离子体运动。此外，超级双极光雷达网络ZHO和麦克默多雷达观测观测到水平电离层对流逆转。研究结果表明，瞬态对流逆转打破了原始的剪切平衡，预计 IP 激波诱发的电场会触发 E 区域的增强速度剪切映射。等离子体的水平运动仅归因于突发脉冲初始阶段存在的从黄昏到黎明的电场。我们还发现电离层对流逆转是由向下的场对齐电流驱动的。这些观测结果首次揭示了尖点电离层对IP冲击的直接和直接响应，这对于理解行星际磁场（IMF）和太阳风条件突然变化后磁层的全球响应至关重要。
Interplanetary (IP) shock‐driven sudden compression of the Earth's magnetosphere produces electromagnetic disturbances in the polar ionosphere. Several studies have examined the effects of IP shock on magnetosphere‐ionosphere coupling systems using all‐sky cameras and radars. In this study, we examine responses and drivers of the polar ionosphere following an IP shock compression on 16 June 2012. We observe the vertical drift and concurrent horizontal motion of the plasma. Observations from digisonde located at Antarctic Zhongshan station (ZHO) showed an ionospheric thick E region ionization and associated vertical downward plasma motion at F region. In addition, horizontal ionospheric convection reversals were observed on the Super Dual Auroral Radar Network ZHO and McMurdo radar observations. Findings suggest that the transient convective reversal breaks the original shear equilibrium, it is expected that the IP shock‐induced electric field triggers an enhanced velocity shear mapping to the E region. The horizontal motion of the plasma was attributed to only the dusk‐to‐dawn electric field that existed during the preliminary phase of sudden impulse. We also found that ionospheric convection reversals were driven by a downward field‐aligned current. The results of these observations reveal, for the first time, the immediate and direct cusp ionosphere response to the IP shock, which is critical for understanding the global response of the magnetosphere following an abrupt change in Interplanetory Magnetic Field (IMF) and solar wind conditions.