Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 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 | S04 | W35 | 01 | 0000 | Alpha | Apr 16, 2006 | Apr 23, 2006 | May 7, 2006 |
| № 872 | S08 | W03 | 03 | 0010 | Beta | Apr 19, 2006 | Apr 25, 2006 | May 9, 2006 |
| № 871 | S06 | W44 | 03 | 0030 | Beta | Apr 16, 2006 | Apr 22, 2006 | May 6, 2006 |
| № 870 | S06 | W72 | 01 | 0010 | Alpha | Apr 13, 2006 | Apr 20, 2006 | May 4, 2006 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1977 to April 2006. The gray background is the average SSN index.
