Fig. 1From: Morphology of sporadic E layers derived from Fengyun-3C GPS radio occultation measurementsExamples of the FY-3C RO observations for Es-layer detection for a without Es layers, b with an Es layer. In each subfigure, the three profiles represent the original L1 SNR profile (in black), the normalized SNR profile (in yellow), and the STD profile (in red), and the identifier of each RO event is shown in the upper right corner of the subfigureBack to article page