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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 17, 2011. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1378 | S17 | W09 | 06 | 0040 | Beta | Dec 17, 2011 | Dec 24, 2011 | Jan 7, 2012 |
| № 1377 | N12 | E15 | 09 | 0070 | Beta | Dec 19, 2011 | Dec 26, 2011 | Jan 9, 2012 |
| № 1375 | N08 | W43 | 01 | 0040 | Alpha | Dec 15, 2011 | Dec 22, 2011 | Jan 4, 2012 |
| № 1374 | S18 | W37 | 04 | 0100 | Beta | Dec 15, 2011 | Dec 22, 2011 | Jan 5, 2012 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to December 2011. The gray background is the average SSN index.
