Identification of scintillation signatures on GPS signals originating from plasma structures detected with EISCAT incoherent scatter radar along the same line of sight.
Identification of scintillation signatures on GPS signals originating from plasma structures detected with EISCAT incoherent scatter radar along the same line of sight.
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DOI：
10.1002/2016ja023271
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发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Bust G
中科院分区：
文献类型：
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作者：
Forte B;Coleman C;Skone S;Häggström I;Mitchell C;Da Dalt F;Panicciari T;Kinrade J;Bust G
电离层闪烁起源于电磁波通过等离子体密度分布中的空间梯度的散射，在给定的传播方向上漂移。电离层闪烁是不利空间气象条件的一种破坏性表现，表现为卫星通信和导航系统及服务的可靠性和连续性下降（例如，欧洲地球静止导航覆盖服务（EGNOS）。这里介绍的实验的目的是确定极光电离结构对全球定位系统闪烁的贡献。欧洲非相干散射（EISCAT）测量是在从特罗姆瑟观测到的给定GPS卫星的同一视线上沿着进行的，随后通过EISCAT UHF雷达进行测量，以确定在共对准GPS无线电链路上引起闪烁的等离子体结构。与电离层槽的极向边缘、夜侧极光椭圆中的极光弧以及亚暴开始时的粒子沉淀相关的大尺度结构确实被确定为L波段相位闪烁增强的原因。第一次观察到，观察到的大尺度结构没有级联成较小尺度的结构，导致增强的相位闪烁而没有幅度闪烁。需要更多的测量和理论来理解负责抑制大尺度到小尺度能量级联的机制，并重现观察结果。这方面是基本的模型通过这些电离结构传播的无线电波的散射。从这一实验中获得的新见解使人们能够更好地描述空间气象可能对卫星电信和导航服务产生的影响。EISCAT非相干散射雷达波束与GPS卫星视线对准极光E和F区没有大尺度到小尺度的能量级联极光E和F区闪烁诱导等离子体梯度
Ionospheric scintillation originates from the scattering of electromagnetic waves through spatial gradients in the plasma density distribution, drifting across a given propagation direction. Ionospheric scintillation represents a disruptive manifestation of adverse space weather conditions through degradation of the reliability and continuity of satellite telecommunication and navigation systems and services (e.g., European Geostationary Navigation Overlay Service, EGNOS). The purpose of the experiment presented here was to determine the contribution of auroral ionization structures to GPS scintillation. European Incoherent Scatter (EISCAT) measurements were obtained along the same line of sight of a given GPS satellite observed from Tromso and followed by means of the EISCAT UHF radar to causally identify plasma structures that give rise to scintillation on the co‐aligned GPS radio link. Large‐scale structures associated with the poleward edge of the ionospheric trough, with auroral arcs in the nightside auroral oval and with particle precipitation at the onset of a substorm were indeed identified as responsible for enhanced phase scintillation at L band. For the first time it was observed that the observed large‐scale structures did not cascade into smaller‐scale structures, leading to enhanced phase scintillation without amplitude scintillation. More measurements and theory are necessary to understand the mechanism responsible for the inhibition of large‐scale to small‐scale energy cascade and to reproduce the observations. This aspect is fundamental to model the scattering of radio waves propagating through these ionization structures. New insights from this experiment allow a better characterization of the impact that space weather can have on satellite telecommunications and navigation services. EISCAT incoherent scatter radar beam co‐aligned with GPS satellite line of sight Absence of large‐scale to small‐scale energy cascade in the auroral E and F regions Scintillation‐inducing plasma gradients in the auroral E and F regions