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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 587 | S13 | E39 | 22 | 0200 | Beta | Apr 5, 2004 | Apr 12, 2004 | Apr 25, 2004 |
| № 585 | S15 | E01 | 03 | 0010 | Beta | Apr 2, 2004 | Apr 9, 2004 | Apr 22, 2004 |
| № 582 | N14 | W07 | 28 | 0250 | Beta-Gamma | Apr 1, 2004 | Apr 8, 2004 | Apr 22, 2004 |
| № 581 | S05 | W13 | 02 | 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.
