Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2866 | S18 | W71 | 03 | 0060 | Alpha | Sep 11, 2021 | Sep 17, 2021 | Oct 1, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to September 2021. The gray background is the average SSN index.
