Fig. 6From: Morphology of sporadic E layers derived from Fengyun-3C GPS radio occultation measurementsSeasonal variation in the altitude–latitude distributions of FY-3C RO-derived Es occurrence numbers (upper panels) and Es occurrence rates (lower panels) during Jan. 2015 to Dec. 2019, with a resolution of 1 km × 5° latitude. Plots for four different seasons a, e MAM; b, f JJA; c, g SON and d, h DJFBack to article page