Mount Wilson classification rules, number of each AR, and total number of joint patches or pixels per Mount Wilson class used in this paper when using the STARA masks.
|Class||Classification rule||Number of AR||Number of patches|
|α||A single dominant spot||50||13,358|
|β||A pair of dominant spots of opposite polarity||192||75,463|
|βγ||A β sunspot where a single north-south polarity||130||95,631|
|inversion line cannot divide the two polarities|
|βγδ||A βγ sunspot where umbrae of opposite polarity are together in a single penumbra||52||66,195|
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