Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 21, 2013. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1754 | S16 | E52 | 01 | 0010 | Alpha | May 26, 2013 | Jun 2, 2013 | Jun 15, 2013 |
| № 1753 | N04 | E65 | 02 | 0060 | Beta | May 27, 2013 | Jun 3, 2013 | Jun 16, 2013 |
| № 1750 | S10 | W81 | 06 | 0100 | Beta | May 16, 2013 | May 23, 2013 | Jun 5, 2013 |
| № 1748 | N12 | W13 | 25 | 0140 | Beta-Gamma-Delta | May 21, 2013 | May 28, 2013 | Jun 10, 2013 |
| № 1746 | S29 | W49 | 04 | 0110 | Beta | May 18, 2013 | May 25, 2013 | Jun 8, 2013 |
| № 1745 | N13 | W51 | 04 | 0150 | Beta | May 18, 2013 | May 25, 2013 | Jun 7, 2013 |
| № 1744 | N06 | W77 | 01 | 0020 | Beta | May 16, 2013 | May 23, 2013 | Jun 5, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to May 2013. The gray background is the average SSN index.
