Fig. 4From: Morphology of sporadic E layers derived from Fengyun-3C GPS radio occultation measurementsTime series of the FY-3C RO-derived Es-layer occurrence rates during Jan. 2015 to Dec. 2019, with a resolution of a 5° latitude × 1-month grid Fig. 7 The local time distribution of FY-3C GPS RO events number during Jan 2015 to Dec 2019Back to article page