Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 556 | N16 | E08 | 12 | 0030 | Beta | Feb 14, 2004 | Feb 21, 2004 | Mar 6, 2004 |
| № 555 | S14 | E34 | 01 | 0010 | Alpha | Feb 16, 2004 | Feb 23, 2004 | Mar 8, 2004 |
| № 554 | S10 | E14 | 07 | 0290 | Beta | Feb 15, 2004 | Feb 22, 2004 | Mar 6, 2004 |
| № 551 | S08 | W66 | 05 | 0090 | Beta | Feb 9, 2004 | Feb 16, 2004 | Feb 29, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to February 2004. The gray background is the average SSN index.
