Study of Ionospheric Variability Using GNSS Observations

作     者：Jouan Taoufiq Bouziani Mourad Azzouzi Rachid Christine Amory-Mazaudier 

作者机构：Institute of Agronomy and Veterinary Medicine Rabat Morocco Université Pierre et Marie Curie (UPMC) Paris France T/ICT4D Abdus Salam ICTP Trieste Italy 

出 版 物：《Positioning》 (导航（英文）)

年 卷 期：2018年第9卷第4期

页      面：79-96页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：GNSS TEC IGS 

摘      要：With the increasing number of applications of Global navigation satellite system, the modeling of the ionosphere is a crucial element for precise positioning. Indeed, the ionosphere delays the electromagnetic waves which pass through it and induces a delay of propagation related to the electronic density (TEC) Total Electronic Content and to the frequency of the wave. The impact of this ionospheric error often results in a poor determination of the station’s position, particularly in strong solar activity. The first part of this paper focuses on a bibliographic study oriented first of all on the study of the ionosphere in relation to solar activity and secondly on the determination of the total electron content using GNSS measurements from the IGS network reference stations. Measurements were made on two permanent stations “RABT, “TETN. We selected years of GNSS measurements to evaluate the geomagnetic impact on the ionosphere, 2001, 2009 and 2013. A description of the ionospheric disturbances and geomagnetic storms was analyzed by determination of TEC, especially in high solar activity. The results show a strong dependence of the ionospheric activity with the geomagnetic activity.