Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 20, 2009. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1037 | N18 | E54 | 02 | 0010 | Beta | Dec 25, 2009 | Jan 1, 2010 | Jan 15, 2010 |
| № 1036 | S29 | W19 | 03 | 0010 | Beta | Dec 20, 2009 | Dec 27, 2009 | Jan 10, 2010 |
| № 1035 | N30 | W56 | 08 | 0220 | Beta | Dec 17, 2009 | Dec 24, 2009 | Jan 7, 2010 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1980 to December 2009. The gray background is the average SSN index.
