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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1184 | N18 | E03 | 15 | 0070 | Beta | Apr 5, 2011 | Apr 12, 2011 | Apr 26, 2011 |
| № 1183 | N17 | W23 | 13 | 0150 | Beta | Apr 3, 2011 | Apr 10, 2011 | Apr 24, 2011 |
| № 1180 | N25 | W48 | 01 | 0030 | Alpha | Apr 1, 2011 | Apr 8, 2011 | Apr 22, 2011 |
| № 1176 | S18 | W88 | 01 | 0040 | Alpha | Mar 29, 2011 | Apr 5, 2011 | Apr 19, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to April 2011. The gray background is the average SSN index.
