Table 1.
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 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.