TITLE:
Study of Ionospheric Variability Using GNSS Observations
AUTHORS:
Jouan Taoufiq, Bouziani Mourad, Azzouzi Rachid, Christine Amory-Mazaudier
KEYWORDS:
GNSS, TEC, IGS
JOURNAL NAME:
Positioning,
Vol.9 No.4,
November
30,
2018
ABSTRACT: 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.