Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 542 | N11 | E54 | 02 | 0060 | Beta | Jan 22, 2004 | Jan 29, 2004 | Feb 11, 2004 |
| № 541 | S09 | W18 | 03 | 0010 | Beta | Jan 17, 2004 | Jan 23, 2004 | Feb 6, 2004 |
| № 540 | S13 | E28 | 13 | 0350 | Beta | Jan 20, 2004 | Jan 27, 2004 | Feb 10, 2004 |
| № 537 | N04 | W57 | 10 | 0160 | Beta-Delta | Jan 14, 2004 | Jan 20, 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.
