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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 21, 2011. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 1218 | S16 | E42 | 01 | 0010 | Alpha | May 25, 2011 | Jun 1, 2011 | Jun 15, 2011 |
| № 1216 | S16 | E21 | 01 | 0090 | Alpha | May 23, 2011 | May 30, 2011 | Jun 13, 2011 |
| № 1214 | S24 | W68 | 01 | 0090 | Alpha | May 17, 2011 | May 24, 2011 | Jun 6, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to May 2011. The gray background is the average SSN index.
