Sunspots and active regions — May 21, 2017
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| 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
Average monthly sunspot number (SSN) from 1988, January to 2017, May. Gray background - average solar cycle.
