Category Archives: sunspots

184. Measuring the Compactness of Active Regions

Contributed by Kelvin Moresi. Posted on August 10, 2022

Compactness is one geometric property of a sunspot group that has not yet been systematically quantified. We calculate the compactness of a small sample of δ-spots and β-spots using a minimum bounding circle. On average, the δ-spots are found to be more than twice as compact as the β-spots.