Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2658 | S07 | E11 | 01 | 0010 | Alpha | May 23, 2017 | May 29, 2017 | Jun 12, 2017 |
| № 2656 | N11 | E10 | 01 | 0020 | Alpha | May 23, 2017 | May 29, 2017 | Jun 12, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to May 2017. The gray background is the average SSN index.
