Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2672 | N05 | E77 | 04 | 0120 | Beta | Aug 28, 2017 | Sep 3, 2017 | Sep 17, 2017 |
| № 2671 | N12 | W04 | 20 | 0410 | Beta-Gamma | Aug 22, 2017 | Aug 28, 2017 | Sep 11, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to August 2017. The gray background is the average SSN index.
