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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 17, 2015. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2419 | N12 | E37 | 05 | 0120 | Beta | Sep 21, 2015 | Sep 27, 2015 | Oct 11, 2015 |
| № 2418 | S16 | E32 | 01 | 0250 | Alpha | Sep 20, 2015 | Sep 27, 2015 | Oct 11, 2015 |
| № 2415 | S20 | W00 | 20 | 0190 | Beta-Gamma | Sep 18, 2015 | Sep 25, 2015 | Oct 9, 2015 |
| № 2414 | S12 | W82 | 01 | 0120 | Alpha | Sep 12, 2015 | Sep 18, 2015 | Oct 2, 2015 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1986 to September 2015. The gray background is the average SSN index.
