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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1196 | S27 | E71 | 04 | 0080 | Beta | Apr 27, 2011 | May 4, 2011 | May 18, 2011 |
| № 1195 | S17 | E57 | 07 | 0100 | Beta | Apr 26, 2011 | May 3, 2011 | May 17, 2011 |
| № 1193 | N16 | W18 | 26 | 0300 | Beta | Apr 20, 2011 | Apr 27, 2011 | May 11, 2011 |
| № 1191 | N07 | W37 | 01 | 0015 | Alpha | Apr 19, 2011 | Apr 26, 2011 | May 9, 2011 |
| № 1190 | N14 | W92 | 02 | 0060 | Beta | Apr 15, 2011 | Apr 22, 2011 | May 5, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to April 2011. The gray background is the average SSN index.
