Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2855 | N13 | E45 | 01 | 0010 | Alpha | Aug 18, 2021 | Aug 24, 2021 | Sep 7, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to August 2021. The gray background is the average SSN index.
