Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 563 | S21 | E66 | 01 | 0030 | Alpha | Feb 27, 2004 | Mar 5, 2004 | Mar 19, 2004 |
| № 562 | S11 | E59 | 02 | 0060 | Beta | Feb 26, 2004 | Mar 4, 2004 | Mar 18, 2004 |
| № 561 | N02 | W01 | 01 | 0010 | Alpha | Feb 22, 2004 | Feb 29, 2004 | Mar 13, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to February 2004. The gray background is the average SSN index.
