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Ionospheric temporal and spatial variations during the 18 August 2003 storm over China

机译：2003年8月18日中国风暴的电离层时空变化

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The effects of the 18 August 2003 geomagnetic storm on the ionosphere over China have been first studied by combining dual-frequency Global Positioning System (GPS) observation data from the Crustal Movement Observation Network of China (CMONOC) using the computerized ionospheric tomography (CIT) technique. The temporal and spatial variations of the ionosphere are analyzed using a time series of ionospheric electron density (IED) maps, and the ionospheric storm evolution process is revealed. The tomographic results show that the main ionospheric effects of this storm over China are: (1) that positive storm phase effects usually happen in the low-latitude ionosphere, (2) that negative storm phase effects occur in the mid-latitude ionosphere, and (3) that the equatorial anomaly structure can also be found. In contrast to the quiet period of the ionosphere on 17 August 2003, the equatorial anomaly crest moved to the north in the main phase of the storm and then moved back to the original location in the recovery phase on 19 August 2003. We compared the peak density NmF2 and the peak height hmF2 obtained from the ionosonde observations at Wuhan station and those inverted by the CIT technique to confirm the reliability of the GPS-based tomographic technique. The tomographic results revealed that the GPS-based CIT technique can be used to monitor large-scale ionospheric disturbances during geomagnetic storms.
机译：首先通过计算机电离层层析成像技术（CIT）结合了来自中国地壳运动观测网络（CMONOC）的双频全球定位系统（GPS）观测数据，首次研究了2003年8月18日地磁风暴对中国电离层的影响。技术。利用电离层电子密度（IED）图的时间序列分析了电离层的时空变化，揭示了电离层风暴的演化过程。层析成像结果表明，这次风暴对中国的主要电离层效应是：（1）低空电离层通常发生正风暴相位效应;（2）中纬度电离层出现负风暴相位效应;以及（3）还可以找到赤道异常结构。与2003年8月17日电离层的平静时期相反，赤道异常波峰在风暴的主要阶段移至北部，然后在2003年8月19日移回恢复阶段的原始位置。我们比较了峰值武汉站离子探空仪观测得到的密度N m F 2 和峰高h m F 2 那些被CIT技术颠倒过来的，以确认基于GPS的层析成像技术的可靠性。层析成像结果表明，基于GPS的CIT技术可用于监视地磁风暴期间的大规模电离层扰动。

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