Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2683 | N13 | E44 | 02 | 0270 | Alpha | Oct 2, 2017 | Oct 9, 2017 | Oct 23, 2017 |
| № 2682 | S10 | E29 | 02 | 0180 | Alpha | Oct 1, 2017 | Oct 8, 2017 | Oct 22, 2017 |
| № 2681 | S13 | W23 | 01 | 0080 | Alpha | Sep 27, 2017 | Oct 4, 2017 | Oct 18, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to September 2017. The gray background is the average SSN index.
