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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1727 | N25 | E46 | 09 | 0050 | Beta | Apr 25, 2013 | May 2, 2013 | May 16, 2013 |
| № 1726 | N13 | W03 | 15 | 0180 | Beta-Gamma | Apr 22, 2013 | Apr 28, 2013 | May 12, 2013 |
| № 1725 | N10 | W68 | 03 | 0010 | Beta | Apr 17, 2013 | Apr 24, 2013 | May 7, 2013 |
| № 1724 | S26 | W17 | 01 | 0010 | Alpha | Apr 21, 2013 | Apr 28, 2013 | May 11, 2013 |
| № 1723 | S19 | W42 | 09 | 0060 | Beta | Apr 19, 2013 | Apr 26, 2013 | May 9, 2013 |
| № 1722 | S20 | W84 | 04 | 0030 | Beta | Apr 15, 2013 | Apr 22, 2013 | May 6, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
