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首页> 外文期刊>Space Weather >Medium-scale traveling ionospheric disturbances in the Korean region on 10 November 2004: Potential impact on GPS-based navigation systems
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Medium-scale traveling ionospheric disturbances in the Korean region on 10 November 2004: Potential impact on GPS-based navigation systems

机译：2004年11月10日在韩国地区发生的中度电离层干扰：对基于GPS的导航系统的潜在影响

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Extreme medium-scale traveling ionospheric disturbances (MSTIDs) occurred at midlatitudes in East Asia during a geomagnetically active time on 10 November 2004. Using the Global Positioning System (GPS) observation data from Korean GPS reference stations, the characteristics of the MSTIDs on 10 November 2004 and their potential impact on GPS-based navigation systems in the Korean region are analyzed. The MSTIDs were first observed in the northeast part of South Korea at about 10:00 UT and propagated southwestward with successive wavefronts which extended from northwest to southeast. The peak-to-peak amplitudes of vertical total electron content (TEC) disturbances decreased from about 29 to 10 total electron content unit (1 TECU = 10 el m∼), and the wavelengths lengthened from about 360 to 580 km from 12:53 to 14:38 UT. The propagation velocity of MSTID wavefronts was estimated using three nearby reference stations showing that velocity gradually decreased from about 254 m/s at 11:46 UT to 76 m/s at 21:26 UT. The ionospheric irregularities in small-scale regions accompanied by the MSTIDs were spatially and temporally varied from about 10:00 to 22:00 UT in response to the movement and intensity change of the MSTIDs. This event also generated anomalously large ionospheric spatial gradients which could cause unacceptable residual pseudorange errors for users of GPS augmentation systems. Frequent loss of the GPS signals, which occurred due to the intense ionospheric irregularities, could also degrade the continuity and availability of GPS-based navigation systems.
机译：2004年11月10日，在东亚中纬度发生地磁活动期间发生了极端中等规模的电离层扰动（MSTID）。利用韩国GPS参考站的全球定位系统（GPS）观测数据，11月10日，MSTID的特征分析了2004年及其对韩国地区基于GPS的导航系统的潜在影响。 MSTIDs最早在韩国东北部10:00时观测到，并向西南传播，并具有从西北向东南延伸的连续波阵面。垂直总电子含量（TEC）干扰的峰峰值幅度从约29个减少到10个总电子含量单位（1 TECU = 10 el m〜），并且波长从12:53延长了约360至580 km到14:38 UT。使用附近的三个参考站估算了MSTID波前的传播速度，表明速度从11:46 UT的约254 m / s逐渐降低到21:26 UT的76 m / s。响应于MSTIDs的运动和强度变化，伴随MSTIDs的小范围电离层不规则性在时空上从UT的10:00到22:00发生变化。此事件还产生异常大的电离层空间梯度，这可能会给GPS增强系统的用户造成无法接受的残留伪距误差。由于强烈的电离层不规则性而导致的GPS信号频繁丢失，也会降低基于GPS的导航系统的连续性和可用性。

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