Imaging of the equatorial ionospheric anomaly over South America—A simulation study of total electron content
Imaging of the equatorial ionospheric anomaly over South America—A simulation study of total electron content
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DOI：
10.1016/j.jastp.2006.05.025
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发表时间：
2006-11
影响因子：
1.9
通讯作者：
B. Zapfe;M. Materassi;C. Mitchell;P. Spalla
中科院分区：
文献类型：
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作者：
B. Zapfe;M. Materassi;C. Mitchell;P. Spalla
由于低纬度地区日变化大，赤道电离层三维成像具有挑战性。反演的总电子含量（TEC）与模型导出的TEC数据作为测量数据的替代沿着卫星到地面的路径允许重建电子密度。该技术是测试使用现实的模拟研究，其中电离层的建模使用国际参考电离层模型和实际的卫星和接收器的位置被用来模拟数据，可以在南美地区收集。使用多仪器数据分析系统（MIDAS）算法，其中重建是基于定义的随机反演的样本空间的经验正交函数（EOFs），需要根据区域，时间和研究的地球物理条件进行调整。深入了解支持垂直电离层重建和适当的水平接收器星座的信息，可以创建低（平均值和最大值）TEC误差的可靠图像。该技术是潜在的物理研究的异常，特别是在风暴事件时，其形态偏离正常的兴趣。
Imaging the equatorial ionosphere in three dimensions is challenging due to the high diurnal variations at low latitudes. Inversions of total electron content (TEC) together with model-derived TEC data as replacement of measurement data along satellite-to-ground paths allow reconstructing electron densities. The technique is tested using a realistic simulation study, where the ionosphere is modelled using the International Reference Ionosphere model and actual satellite and receiver locations are used to simulate the data that can be collected over the South American region. The multi-instrument data analysis system (MIDAS) algorithm is used, where reconstructions are based on defining the sample space of stochastic inversions by empirical orthonormal functions (EOFs), that need to be adjusted depending on region, time and geophysical conditions studied. Insight into information supporting vertical ionospheric reconstructions and suitable horizontal receiver constellations allows to create reliable images of low (mean and maximum) TEC errors. The technique is potentially of interest for physical studies of the anomaly, particularly under storm events when its morphology deviates from normal.