Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 541 | S09 | W01 | 05 | 0030 | Beta | Jan 17, 2004 | Jan 24, 2004 | Feb 6, 2004 |
| № 540 | S13 | E45 | 10 | 0300 | Beta | Jan 20, 2004 | Jan 27, 2004 | Feb 10, 2004 |
| № 537 | N04 | W41 | 12 | 0180 | Beta-Gamma-Delta | Jan 14, 2004 | Jan 21, 2004 | Feb 3, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to January 2004. The gray background is the average SSN index.
