Latitude and intensity of coronal off-limb structures as a function of time. The intensity of the coronal structures in digital number (DN) is represented using a gradual colour-code based on a logarithmic scale, with blue indicating the lowest-intensity structures and red indicating the highest. The distribution of structures per latitude over time clearly illustrates the butterfly diagram (particularly when looking at the highest-intensity reddish structures), with coronal activity moving toward the equator as SC 24 progresses. It also shows the notable rush-to-the-poles phenomenon observed in both hemispheres between 2010 and 2015, with several surges in the northern hemisphere.