Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 588 | S12 | E53 | 04 | 0070 | Beta | Apr 9, 2004 | Apr 16, 2004 | Apr 29, 2004 |
| № 587 | S13 | W01 | 16 | 0130 | Beta | Apr 5, 2004 | Apr 12, 2004 | Apr 25, 2004 |
| № 582 | N14 | W49 | 07 | 0140 | Beta | Apr 1, 2004 | Apr 8, 2004 | Apr 22, 2004 |
| № 581 | S05 | W53 | 01 | 0100 | Alpha | Apr 1, 2004 | Apr 8, 2004 | Apr 21, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to April 2004. The gray background is the average SSN index.
