Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 549 | N13 | E70 | 03 | 0090 | Beta | Feb 7, 2004 | Feb 14, 2004 | Feb 28, 2004 |
| № 548 | N06 | E30 | 01 | 0010 | Alpha | Feb 4, 2004 | Feb 11, 2004 | Feb 25, 2004 |
| № 547 | S10 | E01 | 04 | 0020 | Beta | Feb 2, 2004 | Feb 9, 2004 | Feb 22, 2004 |
| № 546 | S12 | E41 | 01 | 0040 | Alpha | Feb 5, 2004 | Feb 12, 2004 | Feb 26, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to February 2004. The gray background is the average SSN index.
