Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 540 | S11 | E76 | 06 | 0060 | Alpha | Jan 20, 2004 | Jan 27, 2004 | Feb 9, 2004 |
| № 537 | N05 | W03 | 16 | 0240 | Beta-Gamma-Delta | Jan 14, 2004 | Jan 21, 2004 | Feb 3, 2004 |
| № 536 | S12 | W68 | 25 | 0250 | Beta-Gamma | Jan 9, 2004 | Jan 16, 2004 | Jan 29, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to January 2004. The gray background is the average SSN index.
