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Study of Ionospheric Variability Using GNSS Observations

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Document pages: 18 pages

Abstract: With the increasing number of applications of Globalnavigation satellite system, the modeling of the ionosphere is a crucialelement for precise positioning. Indeed, the ionosphere delays theelectromagnetic waves which pass through it and induces a delay of propagationrelated to the electronic density (TEC) Total Electronic Content and to thefrequency of the wave. The impact of this ionospheric error often results in apoor determination of the station’s position, particularly in strong solaractivity. The first part of this paper focuses on a bibliographic studyoriented first of all on the study of the ionosphere in relation to solaractivity and secondly on the determination of the total electron content usingGNSS 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 onthe ionosphere, 2001, 2009 and 2013. A description of the ionosphericdisturbances and geomagnetic storms was analyzed by determination of TEC,especially in high solar activity. The results show a strong dependence of theionospheric activity with the geomagnetic activity.

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