Figure 21From: Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II periodThe solar cycle dependence of HILDCAAs. The relative occurrence of HILDCAAs during cycles 21, 22, and 23. The F10.7 solar flux is given as a black line. ‘G’ represents data gaps. No AE data were available for the years 1976 and 1977. The figure is taken from Hajra et al. (2013).Back to article page