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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 20, 2009. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1015 | N22 | W37 | 01 | 0010 | Alpha | Apr 18, 2009 | Apr 25, 2009 | May 9, 2009 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1980 to April 2009. The gray background is the average SSN index.
