Fig. 1From: Sporadic E layer characteristics at equatorial latitudes as observed by GNSS radio occultation measurementsAnnual number of analyzed GNSS RO profiles. The different colors indicate the various satellite missions. The abbreviation CHA stands for the CHAMP satellite, SPI for Spire, KOM5 for KOMPSAT-5. CO1 and CO2 refer to the COSMIC missions and TDX and TSX stand for TANDEM-X, and TerraSAR-X, respectivelyBack to article page