Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 20, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2680 | N08 | W51 | 01 | 0050 | Alpha | Sep 17, 2017 | Sep 24, 2017 | Oct 7, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to September 2017. The gray background is the average SSN index.
