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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1724 | S27 | E60 | 03 | 0050 | Alpha | Apr 21, 2013 | Apr 28, 2013 | May 12, 2013 |
| № 1723 | S18 | E38 | 08 | 0080 | Beta | Apr 19, 2013 | Apr 26, 2013 | May 9, 2013 |
| № 1722 | S22 | W09 | 04 | 0020 | Beta | Apr 15, 2013 | Apr 22, 2013 | May 6, 2013 |
| № 1721 | S19 | W19 | 13 | 0180 | Beta | Apr 14, 2013 | Apr 21, 2013 | May 5, 2013 |
| № 1719 | N10 | W39 | 11 | 0120 | Beta-Gamma | Apr 13, 2013 | Apr 20, 2013 | May 3, 2013 |
| № 1718 | N20 | W68 | 12 | 0260 | Beta-Gamma | Apr 11, 2013 | Apr 18, 2013 | May 1, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
