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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Application of Slepian theory for improving the accuracy of SH-based global ionosphere models in the Arctic region
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Application of Slepian theory for improving the accuracy of SH-based global ionosphere models in the Arctic region

机译：斯莱皮恩理论对于改进中的应用SH-based全球电离层模型的准确性北极地区

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摘要

Due to significant energy resources in polar regions, they have emerged as strategic parts of the world. Consequently, various researches have been funded in order to study these areas in further details. This research intends to improve the accuracy of spherical harmonic (SH)-based Global Ionospheric Models(GIMs) by reconstructing a new map of ionosphere in the Arctic region. For this purpose, the spatiospectral concentration is applied to optimize the base functions. It is carried out using the Slepian theory which was developed by Simons. Here the new base functions and the corresponding coefficients are derived from the SH models for the polar regions. Then, VTEC (vertical total electron content) is reconstructed using Slepian functions and the new coefficients. Reconstructed VTECs and the VTECs derived from SH models are compared to the estimates of this parameter, which are directly derived from dual-frequency GPS measurements. Three International Global Navigation Satellite Systems Service stations located in the northern polar region have been used for this purpose. The starting and ending day of year of adopted GPS data are 69 and 83, respectively, (totally 15 successive days) of the year 2013. According to the obtained results, on average, application of Slepian theory can improve accuracy of the GIM by 1 to 2 total electron content unit (TECU) (1 TECU = 10~(16) elm~(-2)) in the Arctic region.
机译：由于在极重要的能源资源地区,他们已成为战略部分他的整个世界。是为了研究这些地区资助进一步的细节。球面谐波(SH)的的准确性通过重建全球电离层模型(姓)一个新的电离层在北极地区的地图。这个目的,spatiospectral浓度应用于优化基础功能。使用的斯莱皮恩理论由西蒙斯。和相应的系数从极地的SH模型。VTEC(垂直总电子含量)重建使用斯莱皮恩和新功能系数。来自SH模型相比这个参数的估计,直接来自双频GPS测量。三个国际全球导航卫星系统服务站位于北部极地被用于此目的。采用GPS年开始和结束的一天数据是69和83,分别(完全152013年的连续天)。平均结果的应用斯莱皮恩理论可以提高GIM的准确性1 - 2总电子含量单元(特)(1为一例= 10 ~(16)榆树~(2))在北极地区。

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