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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 18, 2004. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 713 | S10 | E70 | 01 | 0070 | Alpha | Dec 24, 2004 | Dec 31, 2004 | Jan 14, 2005 |
| № 712 | S10 | E50 | 04 | 0020 | Beta | Dec 23, 2004 | Dec 30, 2004 | Jan 12, 2005 |
| № 710 | S07 | W72 | 05 | 0050 | Beta | Dec 14, 2004 | Dec 20, 2004 | Jan 3, 2005 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to December 2004. The gray background is the average SSN index.
