Fig. 8From: Double-thin-shell approach to deriving total electron content from GNSS signals and implications for ionospheric dynamics near the magnetic equatorTEC maps. a–c Vertical TEC reconstructed by double-shell model with shell height combinations of 250/600, 300/600, and 300/700 km for lower/higher shells, and d–f TEC error for double-shell model reconstruction for each shell height combinationBack to article page