An Empirical Model of Ionospheric Total Electron Content Based on Tide-Like Signature Modeling

IF 3.7 2区 地球科学 Space Weather Pub Date : 2023-12-07 DOI:10.1029/2023sw003564
Haibing Ruan, Jiuhou Lei, Jianyong Lu, Fen Tang
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Abstract

Accurate modeling of the total electron content (TEC) benefits scientific research and practical application. In this study, the global ionospheric maps from the Center for Orbit Determination of Europe (CODE) covering the years 2000–2021 are utilized to develop an empirical model of TEC by superposing the tide-like components in the ionosphere. The tide-like components, including the migrating and non-migrating ones, are first derived from the daily CODE TEC data. Then, the sine and cosine components of a tide-like signature are separately decomposed into the basic modes as a function of the modified inclination latitude with the principle component analysis, and the temporal evolution is regressed to the solar radiation dependence and interannual variation. As such, the climatological behavior of tidal amplitudes and phases could be well parameterized, and the developed model is capable of reproducing the global TEC patterns. The modeled TEC agrees well with the CODE input data with zero systematic error and a low root mean square error of 3.849 TECu, demonstrating a good model performance. This developed model, associated with the parametric tide-like signatures, could serve as a background for future investigations of the ionospheric responses to the forcing from below or above.
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基于潮汐样特征建模的电离层总电子含量经验模型
电子总含量(TEC)的精确建模有利于科学研究和实际应用。在本研究中,利用欧洲轨道测定中心(CODE)提供的 2000-2021 年全球电离层地图,通过叠加电离层中的类潮成分,建立了一个 TEC 经验模型。首先从 CODE 的每日 TEC 数据中得出类潮成分,包括迁移和非迁移成分。然后,利用原理成分分析法将类潮特征的正弦和余弦成分分别分解为与修正倾角纬度函数相关的基本模式,并将其时间演变与太阳辐射相关性和年际变化进行回归。因此,潮汐振幅和相位的气候学行为可以很好地参数化,所建立的模式能够再现全球 TEC 模式。模拟的 TEC 与 CODE 输入数据非常吻合,系统误差为零,均方根误差为 3.849 TECu,显示了模型的良好性能。所建立的这一模型与类似潮汐的参数特征相关联,可作为今后研究电离层对来自下方或上方的强迫的响应的背景。
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