Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 17, 2021. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2857 | N17 | W25 | 04 | 0030 | Beta | Aug 16, 2021 | Aug 23, 2021 | Sep 5, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to August 2021. The gray background is the average SSN index.
