Fig. 5From: Quasi-4-dimension ionospheric modeling and its application in PPPDistribution of \(\left| {C_{i} } \right|\) (the top two sub-plots), μi (the left-bottom sub-plot), σi (the right-bottom sub-plot) in Eq. (7) against elevation angle and azimuth angle for latitude 64.6° and longitude 40.7° of solution A (\(12\times 8\times 6\times 25\)) on DOY 001, 2020Back to article page