Fig. 5
From: Morphology of sporadic E layers derived from Fengyun-3C GPS radio occultation measurements
Seasonal variation in the horizontal distributions of the FY-3C RO-derived Es occurrence rates during Jan. 2015 to Dec. 2019, with the resolution of a 5° × 5° grid. Plots for a March, April and May (MAM); b Jun, July, and August (JJA); c September, October, and November (SON), and d December, January, and February (DJF). In each subfigure, the pink curve represents the geomagnetic equator and the red curves represent the geomagnetic inclination isolines