Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 544 | N08 | E09 | 14 | 0130 | Beta-Gamma | Jan 23, 2004 | Jan 29, 2004 | Feb 12, 2004 |
| № 543 | S17 | W08 | 05 | 0080 | Beta-Gamma | Jan 21, 2004 | Jan 28, 2004 | Feb 11, 2004 |
| № 542 | N10 | W03 | 12 | 0110 | Beta-Gamma | Jan 22, 2004 | Jan 29, 2004 | Feb 11, 2004 |
| № 540 | S14 | W22 | 23 | 0220 | Beta-Gamma-Delta | Jan 20, 2004 | Jan 27, 2004 | Feb 10, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to January 2004. The gray background is the average SSN index.
