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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1722 | S21 | E19 | 04 | 0030 | Beta | Apr 15, 2013 | Apr 22, 2013 | May 6, 2013 |
| № 1721 | S18 | E08 | 17 | 0220 | Beta-Gamma | Apr 14, 2013 | Apr 21, 2013 | May 5, 2013 |
| № 1719 | N11 | W12 | 22 | 0290 | Beta-Gamma | Apr 13, 2013 | Apr 20, 2013 | May 3, 2013 |
| № 1718 | N21 | W44 | 23 | 0510 | Beta-Gamma | Apr 10, 2013 | Apr 17, 2013 | May 1, 2013 |
| № 1714 | N13 | W64 | 01 | 0070 | Alpha | Apr 9, 2013 | Apr 16, 2013 | Apr 29, 2013 |
| № 1711 | S16 | W93 | 01 | 0100 | Alpha | Apr 7, 2013 | Apr 14, 2013 | Apr 27, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
