Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2681 | S13 | E42 | 01 | 0080 | Alpha | Sep 27, 2017 | Oct 4, 2017 | Oct 18, 2017 |
| № 2680 | N07 | W97 | 01 | 0060 | 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.
