在强亚暴极光期间在极光卵的夜侧向极边缘的严重和局部的GNSS闪烁
Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm aurora
摘要：
在本文中，我们研究了如何GPS，GLONASS和伽利略导航信号受到影响的强烈的不规则性，导致严重的相位闪烁（$\mathit{σ}_{ϕ}$ > 1）在夜侧高纬度电离层在2013年11月3日的亚暴。亚暴的开始和后来的增强与极帽斑块进入极光卵成为极光斑点相吻合。使用全球导航卫星系统（GNSS）接收器和光学数据，我们显示了严重的闪烁驱动强烈的极光发射在接收器和卫星之间的视线。在亚暴扩张期间，闪烁区沿着强烈的极光卵向极边缘。强烈的极光发射与极地帽斑块（斑点）共存。无论是在进入极光卵之前，还是在极光消失之后，这些斑块都没有强烈的不规则性。来自所有三个全球导航卫星系统星座的信号同样受到不规则性的影响。此外，相距约120公里的两个接收器报告的闪烁影响差异很大，一个接收器中一半卫星闪烁强烈，另一个接收器中没有闪烁。这表明，在夜侧电离层中严重不规则的区域可以高度局部化。在整个间期内振幅振幅均较低。
英文摘要：
In this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation ($\mathit{σ}_{ϕ}$ > 1) in the nightside high-latitude ionosphere during a substorm on 3 November 2013. Substorm onset and a later intensification coincided with polar cap patches entering the auroral oval to become auroral blobs. Using Global Navigation Satellite Systems (GNSS) receivers and optical data, we show severe scintillation driven by intense auroral emissions in the line of sight between the receiver and the satellites. During substorm expansion, the area of scintillation followed the intense poleward edge of the auroral oval. The intense auroral emissions were colocated with polar cap patches (blobs). The patches did not contain strong irregularities, neither before entering the auroral oval nor after the aurora had faded. Signals from all three GNSS constellations were similarly affected by the irregularities. Furthermore, two receivers spaced around 120km apart reported highly different scintillation impacts, with strong scintillation on half of the satellites in one receiver and no scintillation in the other. This shows that areas of severe irregularities in the nightside ionosphere can be highly localized. Amplitude scintillations were low throughout the entire interval.
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