Subauroral TEC Enhancement, GNSS Scintillation, and Positioning Error During STEVE

IF 2.9 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS Journal of Geophysical Research: Space Physics Pub Date : 2024-12-21 DOI:10.1029/2024JA033345

R. H. Chen, Y. Nishimura, W. Liao, J. L. Semeter, M. D. Zettergren, E. F. Donovan, V. Angelopoulos

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Abstract

We report the first simultaneous observations of total electron content (TEC), radio signal scintillation, and precise point positioning (PPP) variation associated with Strong Thermal Emission Velocity Enhancement (STEVE) emissions during a 26 March 2008 storm-time substorm. Despite that the mid-latitude trough TEC decreases during the substorm overall, interestingly, we found an unexpected TEC enhancement (by ∼2 TECU) during STEVE. Enhancement of vertical TEC and phase scintillation was highly localized to STEVE within a thin latitudinal band of 1°. As STEVE shifted equatorward, TEC enhancement was found at and slightly poleward of the optical emission. PPP exhibited enhanced variation across a 3° latitudinal range around STEVE and indicated increased GNSS positioning error. We suggest that TEC enhancement during STEVE creates local TEC structures in the ionosphere that degrade Global Navigation Satellite Systems (GNSS) signals and PPP performance. The TEC enhancement may be created by particle precipitation, Pedersen drift across STEVE, neutral wind, or plasma instability.

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STEVE 期间的副金牛座 TEC 增强、GNSS 闪烁和定位误差

我们报告了在2008年3月26日风暴时间亚暴期间首次同时观测到总电子含量（TEC）、无线电信号闪烁和精确点定位（PPP）变化与强热发射速度增强（STEVE）发射相关。尽管在次暴期间，中纬度槽TEC总体上减少，但有趣的是，我们发现在STEVE期间，TEC意外增强（约2 TECU）。垂直TEC和相位闪烁的增强高度局限于1°的窄纬带内的STEVE。当STEVE向赤道方向移动时，在光学发射处发现TEC增强，并且稍微向极地方向移动。PPP在史蒂夫周围3°纬度范围内表现出增强的变化，并表明GNSS定位误差增加。我们认为，在STEVE期间TEC的增强会在电离层中产生局部TEC结构，从而降低全球导航卫星系统（GNSS）信号和PPP性能。TEC增强可能是由粒子沉淀、Pedersen漂移、中性风或等离子体不稳定造成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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