Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 749 | S06 | E63 | 01 | 0050 | Alpha | Apr 10, 2005 | Apr 17, 2005 | Apr 30, 2005 |
| № 748 | N11 | E20 | 01 | 0010 | Alpha | Apr 7, 2005 | Apr 13, 2005 | Apr 27, 2005 |
| № 747 | S05 | W19 | 06 | 0060 | Beta | Apr 4, 2005 | Apr 10, 2005 | Apr 24, 2005 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1976 to April 2005. The gray background is the average SSN index.
