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首页> 外文期刊>Advances in space research >Performance analysis of quiet and disturbed time ionospheric TEC responses from GPS-based observations, IGS-GIM, IRI-2016 and SPIM/IRI-Plas 2017 models over the low latitude Indian region
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Performance analysis of quiet and disturbed time ionospheric TEC responses from GPS-based observations, IGS-GIM, IRI-2016 and SPIM/IRI-Plas 2017 models over the low latitude Indian region

机译：基于GPS的观测，IGS-GIM，IRI-2016和SPIM / IRI-PLAS 2017模型在低纬度印度地区的安静和扰动时间电离层TEC响应的性能分析

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This paper focuses on the variability of ionospheric Total Electron Content (TEC) over low latitude Indian sub-continental region during the geomagnetically quiet and disturbed periods under the high solar activity phase (years 2012-2015) of the 24th solar cycle. The study is carried out with Global Positioning System (GPS) observations from four International Global Navigation Satellite System Service (IGS) stations, aligned in a longitudinal fashion from magnetic equatorial location to beyond Equatorial Ionization Anomaly (EIA) crest latitude across Indian longitude. The corresponding values are extracted by four-point Inverse Distance Weighted (IDW) interpolation of TEC from IGS-Global Ionosphere Maps (IGS-GIMs) and by running the globally acceptable empirical ionosphere models: International Reference Ionosphere (IRI-2016) and Standard Plasmasphere Ionosphere Model (SPIM/IRI-Plas 2017). Apart from the manifestations of broader daytime diurnal peak TEC, its double-humped structure, EIA, winter anomaly/seasonal anomaly, and storm-time alterations, the study tried to probe the model performances with respect to the GPS based TEC observations. While GIM-TEC portrays a systematically varying magnitude for a particular location, the underestimation (equatorial latitude) and overestimation (higher latitude) is being witnessed by IRI model in the diurnal and seasonal variations. However, SPIM-2017 manifests an all-time overestimated TEC irrespective of time and season though the variation pattern replicates the GPS-TEC observations. Concerning storm-time response, the sub-models embedded in IRI/SPIM hardly reveal a remarkable alteration in the regular TEC variation except for trivial divergences in the IRI outcomes. In spite of compelling timely improvements in climatological representations, the limited storm-time response in IRI/SPIM models attracts the attention for further improvements in the existing primitive storm model specifications. Moreover, the intentional ingestion of external GPS-TEC into the SPIM-2017 model resulted in an exceptional improvement (about 75%) in the model prediction with improved correlation coefficients. The results from this study would complement a realistic global climatological representation of ionosphere for a faithful estimation of ionospheric delay error in radio signal applications. Finally, our results emphasize the flexibility of scopes in SPIM-2017 model towards external ingestions of observed ionospheric parameters. The ingestion of optional inputs convolved with resealing and optimization would significantly improve the model performances for global climatological as well as storm-time ionospheric representation. (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：本文重点介绍了在第24届太阳能阶段的高太阳能阶段（2012-2015）下的地磁安静和受扰动期间低纬度印度亚大陆地区的电离层总电子含量（TEC）的可变性。该研究与来自四个国际全球导航卫星系统服务（IGS）站的全球定位系统（GPS）观察，以磁赤道地点与磁赤道地点的纵向方式对齐，以超越印度经度的赤道电离异常（EIA）峰纬度。相应的值通过来自IGS-全球电离层地图（IGS-GIM）的TEC的四分逆距离加权（IDW）插值来提取，并通过运行全球可接受的经验电离层模型：国际参考电离层（IRI-2016）和标准的Plasmasphere电离层模型（Spim / Iri-Plas 2017）。除了更广泛的白天日峰值TEC的表现外，其双峰结构，EIA，冬季异常/季节性异常和风暴时间改变，该研究试图探讨了基于GPS的TEC观测的模型表演。虽然GIM-TEC对特定位置描绘了系统地变化的幅度，但是在昼夜和季节变化中，IRI模型正在寻求低估（赤道纬度）和高估（更高的纬度）。然而，Spim-2017表现出alime-time过高的Tec，而不管变化模式复制GPS-Tec观察。关于风暴时间响应，嵌入IRI / SPIM的子模型几乎没有揭示常规TEC变化的显着改变，除了IRI结果中的琐碎。尽管对气候陈述的及时改善有令人兴奋，但IRI / SPIM模型的有限风暴时间响应会引起现有原始风暴模型规范的进一步改善。此外，在模型预测中，将外部GPS-TEC的故意摄入到SPIM-2017模型中导致了具有改进的相关系数的模型预测中的特殊改进（约75％）。本研究的结果将补充电离层的逼真的全球气候表达，以忠实地估计无线电信号应用中的电离层延迟误差。最后，我们的结果强调了Spim-2017模型在观察到的电离层参数外部摄入的范围内的灵活性。通过重新密封和优化卷积的可选输入的摄取将显着改善全球气候学以及暴风雨时间电离层表示的模型性能。 （c）2019 Cospar。 elsevier有限公司出版。保留所有权利。

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