Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 754 | S08 | E21 | 05 | 0040 | Beta | Apr 20, 2005 | Apr 27, 2005 | May 10, 2005 |
| № 753 | N12 | W47 | 01 | 0010 | Alpha | Apr 15, 2005 | Apr 21, 2005 | May 5, 2005 |
| № 752 | N02 | E12 | 05 | 0090 | Beta | Apr 19, 2005 | Apr 26, 2005 | May 9, 2005 |
| № 750 | S08 | W68 | 01 | 0020 | Alpha | Apr 13, 2005 | Apr 20, 2005 | May 3, 2005 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1976 to April 2005. The gray background is the average SSN index.
