Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2677 | N19 | E66 | 02 | 0010 | Alpha | Sep 10, 2017 | Sep 17, 2017 | Oct 1, 2017 |
| № 2676 | S11 | W49 | 06 | 0020 | Beta | Sep 1, 2017 | Sep 8, 2017 | Sep 22, 2017 |
| № 2675 | S07 | W61 | 05 | 0050 | Beta | Aug 31, 2017 | Sep 7, 2017 | Sep 21, 2017 |
| № 2674 | N14 | E14 | 21 | 0930 | Beta | Sep 6, 2017 | Sep 13, 2017 | Sep 26, 2017 |
| № 2673 | S10 | W00 | 12 | 0130 | Beta-Gamma | Sep 5, 2017 | Sep 12, 2017 | Sep 25, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to September 2017. The gray background is the average SSN index.
