Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 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 | S26 | E21 | 04 | 0040 | Beta | Apr 20, 2013 | Apr 27, 2013 | May 11, 2013 |
| № 1723 | S18 | W03 | 21 | 0200 | Beta | Apr 19, 2013 | Apr 25, 2013 | May 9, 2013 |
| № 1722 | S19 | W46 | 06 | 0090 | Beta | Apr 15, 2013 | Apr 22, 2013 | May 6, 2013 |
| № 1721 | S17 | W59 | 05 | 0120 | Beta | Apr 14, 2013 | Apr 21, 2013 | May 5, 2013 |
| № 1719 | N10 | W77 | 03 | 0050 | Beta | Apr 13, 2013 | Apr 20, 2013 | May 3, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
