Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2420 | N09 | E73 | 12 | 0270 | Beta-Gamma | Sep 27, 2015 | Oct 4, 2015 | Oct 18, 2015 |
| № 2419 | N12 | W17 | 05 | 0030 | Beta | Sep 21, 2015 | Sep 27, 2015 | Oct 11, 2015 |
| № 2418 | S15 | W19 | 05 | 0210 | Beta | Sep 20, 2015 | Sep 27, 2015 | Oct 11, 2015 |
| № 2415 | S19 | W54 | 12 | 0240 | Beta-Gamma | Sep 18, 2015 | Sep 25, 2015 | Oct 8, 2015 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1986 to September 2015. The gray background is the average SSN index.
