Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 20, 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 | N26 | E53 | 02 | 0040 | Beta | Apr 25, 2013 | May 2, 2013 | May 16, 2013 |
| № 1726 | N13 | E03 | 04 | 0020 | Beta | Apr 22, 2013 | Apr 28, 2013 | May 12, 2013 |
| № 1725 | N10 | W62 | 02 | 0020 | Beta | Apr 17, 2013 | Apr 23, 2013 | May 7, 2013 |
| № 1724 | S26 | W09 | 02 | 0020 | Alpha | Apr 21, 2013 | Apr 28, 2013 | May 12, 2013 |
| № 1723 | S18 | W36 | 14 | 0100 | Beta | Apr 19, 2013 | Apr 25, 2013 | May 9, 2013 |
| № 1722 | S21 | W77 | 06 | 0040 | Beta | Apr 15, 2013 | Apr 22, 2013 | May 6, 2013 |
| № 1721 | S18 | W90 | 01 | 0060 | Alpha | Apr 14, 2013 | Apr 21, 2013 | May 5, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
