Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 2017. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2652 | N13 | E62 | 01 | 0010 | Alpha | Apr 27, 2017 | May 3, 2017 | May 17, 2017 |
| № 2651 | N12 | E46 | 05 | 0130 | Beta | Apr 25, 2017 | May 2, 2017 | May 16, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to April 2017. The gray background is the average SSN index.
