Fig. 3From: Analysis of close conjunctions between dayside polar cap airglow patches and flow channels by all-sky imager and DMSP Panels a, b are blowups of Fig. 2i, j. The red and green points indicate the maximum density/velocity and the threshold values (see text) of density/velocity enhancements, respectively. The blue and red lines show background density/velocity and threshold values of density/velocity enhancements, respectivelyBack to article page