Fig. 7From: 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 65.9° and longitude 42.0° of solution C (\(36\times 24\times 18\times 75\)) on DOY 001, 2020Back to article page