Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 17, 2006. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 873 | N01 | W15 | 04 | 0010 | Beta | Apr 17, 2006 | Apr 23, 2006 | May 7, 2006 |
| № 872 | S06 | E10 | 06 | 0020 | Beta | Apr 19, 2006 | Apr 25, 2006 | May 9, 2006 |
| № 871 | S06 | W31 | 05 | 0060 | Beta | Apr 16, 2006 | Apr 22, 2006 | May 6, 2006 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1977 to April 2006. The gray background is the average SSN index.
