Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 28, 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 | S09 | W65 | 01 | 0100 | Alpha | Dec 24, 2004 | Dec 31, 2004 | Jan 13, 2005 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to December 2004. The gray background is the average SSN index.
