The study investigates ionospheric TEC variation over the Turkish region using 5 GNSS stations. The results showed that the overall TEC values display the trend of normal diurnal and annual TEC variations.

Kutubuddin Ansari

Faculty of Geodesy and Cartography, Warsaw University of Technology, Warsaw, Poland

Janusz Walo

Faculty of Geodesy and Cartography, Warsaw University of Technology, Warsaw, Poland

Selcuk Sagir

Department …