Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2691 | S03 | E16 | 03 | 0010 | Beta | Dec 15, 2017 | Dec 22, 2017 | Jan 4, 2018 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to December 2017. The gray background is the average SSN index.
