Simultaneous Global Ionospheric Disturbances Associated With Penetration Electric Fields During Intense and Minor Solar and Geomagnetic Disturbances
Simultaneous Global Ionospheric Disturbances Associated With Penetration Electric Fields During Intense and Minor Solar and Geomagnetic Disturbances
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DOI：
10.1029/2023gl104250
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发表时间：
2023-09
影响因子：
5.2
通讯作者：
Shunrong Zhang;Y. Nishimura;J. Vierinen;L. Lyons;D. Knipp;Björn J. Gustavsson;Bhagyashree V. Waghule;P. Erickson;A. Coster;Ercha Aa;A. Spicher
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文献类型：
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作者：
Shunrong Zhang;Y. Nishimura;J. Vierinen;L. Lyons;D. Knipp;Björn J. Gustavsson;Bhagyashree V. Waghule;P. Erickson;A. Coster;Ercha Aa;A. Spicher
一种新的观测现象，称为全球电离层密度扰动（SGD），在GNSS总电子含量（TEC）数据中确定了三个典型的地球空间扰动期间：日冕物质抛射驱动的严重扰动事件，高速流事件和最大Kp为4的轻微扰动日。SGD经常发生在昼侧和黎明扇区，TEC增加101%。值得注意的是，SGD可以在轻微的太阳地磁扰动下发生。SGD很可能是由太阳-地磁起源的穿透电场（PEFs）引起的，因为它们与Bz向南、极光AL/Au增加和太阳风压增强有关。这些研究结果提供了新的见解PEFs的性质及其电离层的影响，同时确认了一些关键的早期结果通过替代方法获得。重要的是，广泛的全球导航卫星系统网络具有至少6，000个全球分布的电离层研究接收器，这意味着可以获得丰富的PEF信息，为研究人员研究地球空间电动力学提供了许多机会。
A new observational phenomenon, named Simultaneous Global Ionospheric Density Disturbance (SGD), is identified in GNSS total electron content (TEC) data during periods of three typical geospace disturbances: a Coronal Mass Ejection‐driven severe disturbance event, a high‐speed stream event, and a minor disturbance day with a maximum Kp of 4. SGDs occur frequently on dayside and dawn sectors, with a ∼1% TEC increase. Notably, SGDs can occur under minor solar‐geomagnetic disturbances. SGDs are likely caused by penetration electric fields (PEFs) of solar‐geomagnetic origin, as they are associated with Bz southward, increased auroral AL/AU, and solar wind pressure enhancements. These findings offer new insights into the nature of PEFs and their ionospheric impact while confirming some key earlier results obtained through alternative methods. Importantly, the accessibility of extensive GNSS networks, with at least 6,000 globally distributed receivers for ionospheric research, means that rich PEF information can be acquired, offering researchers numerous opportunities to investigate geospace electrodynamics.