Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 28, 2004. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 599 | N14 | W02 | 07 | 0140 | Beta | Apr 29, 2004 | May 6, 2004 | May 20, 2004 |
| № 596 | S08 | W71 | 01 | 0170 | Beta | Apr 24, 2004 | May 1, 2004 | May 14, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to April 2004. The gray background is the average SSN index.
