Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 21, 2005. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 736 | N13 | W55 | 06 | 0030 | Beta | Feb 18, 2005 | Feb 25, 2005 | Mar 11, 2005 |
| № 735 | S09 | W63 | 12 | 0440 | Beta-Gamma | Feb 18, 2005 | Feb 24, 2005 | Mar 10, 2005 |
| № 734 | S05 | W81 | 01 | 0040 | Alpha | Feb 16, 2005 | Feb 23, 2005 | Mar 9, 2005 |
| № 733 | S08 | W98 | 01 | 0070 | Alpha | Feb 15, 2005 | Feb 22, 2005 | Mar 7, 2005 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1976 to February 2005. The gray background is the average SSN index.
