Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 16, 2018. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2731 | N13 | E35 | 02 | 0010 | Alpha | Dec 20, 2018 | Dec 26, 2018 | Jan 9, 2019 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1989 to December 2018. The gray background is the average SSN index.
