Fig. 2From: Morphology of sporadic E layers derived from Fengyun-3C GPS radio occultation measurementsSpatial distribution of the numbers of a all FY-3C RO 50-Hz observations and b FY-3C RO observations with Es events, which are binned within a grid of 5° × 5° for the period from January 2015 to December 2019. The pink curve represents the geomagnetic equator and the red curves represent the geomagnetic inclination isolinesBack to article page