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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1193 | N16 | E21 | 21 | 0430 | Beta-Gamma | Apr 20, 2011 | Apr 27, 2011 | May 11, 2011 |
| № 1191 | N08 | E09 | 05 | 0070 | Beta | Apr 20, 2011 | Apr 26, 2011 | May 10, 2011 |
| № 1190 | N14 | W51 | 11 | 0310 | Beta-Gamma | 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.
