Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 28, 2011. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1199 | N21 | W34 | 12 | 0120 | Beta | Apr 26, 2011 | May 3, 2011 | May 17, 2011 |
| № 1195 | S17 | W38 | 07 | 0230 | Beta | Apr 26, 2011 | May 3, 2011 | May 17, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to April 2011. The gray background is the average SSN index.
