Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 2681 | S13 | E59 | 01 | 0080 | Alpha | Sep 27, 2017 | Oct 4, 2017 | Oct 18, 2017 |
| № 2680 | N08 | W80 | 01 | 0050 | Alpha | Sep 17, 2017 | Sep 24, 2017 | Oct 7, 2017 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1988, January to 2017, September. Gray background - average solar cycle.
