Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2435 | S17 | E74 | 01 | 0020 | Alpha | Oct 24, 2015 | Oct 30, 2015 | Nov 13, 2015 |
| № 2434 | S10 | E34 | 22 | 0150 | Beta-Gamma | Oct 21, 2015 | Oct 27, 2015 | Nov 10, 2015 |
| № 2432 | S21 | W23 | 04 | 0010 | Beta | Oct 16, 2015 | Oct 23, 2015 | Nov 6, 2015 |
| № 2431 | S18 | W07 | 01 | 0020 | Alpha | Oct 17, 2015 | Oct 24, 2015 | Nov 7, 2015 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1986 to October 2015. The gray background is the average SSN index.
