Fig. 10From: Double-thin-shell approach to deriving total electron content from GNSS signals and implications for ionospheric dynamics near the magnetic equatorTEC maps derived from actual observations by single-shell model. a–c Vertical TEC for shell heights of 350, 450, and 550 km, and d–f difference between left panels and double-shell TEC with shell height combination of 300 and 600 km as shown in Fig. 9aBack to article page