Fig. 9From: Comparisons of in situ ionospheric density using ion velocity meters onboard FORMOSAT-7/COSMIC-2 and ICON missionsSimultaneous observations of unwarped OI 630.0Â nm airglow images with the ion density of F7/C2E3 (left) at 22:30 LT and (right) at 22:36 LT on 18 October 2020. The green and red curves indicate the F7/C2E3 orbit and ion density, respectively. The locations of the two weak plasma depletions in the images are highlighted using dashed rectanglesBack to article page