Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2864 | S23 | E23 | 04 | 0030 | Beta | Sep 7, 2021 | Sep 14, 2021 | Sep 27, 2021 |
| № 2863 | S16 | E16 | 09 | 0160 | Beta | Sep 6, 2021 | Sep 13, 2021 | Sep 27, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to September 2021. The gray background is the average SSN index.
