Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 588 | S12 | E66 | 01 | 0060 | Alpha | Apr 9, 2004 | Apr 16, 2004 | Apr 29, 2004 |
| № 587 | S13 | E13 | 30 | 0160 | Beta | Apr 5, 2004 | Apr 12, 2004 | Apr 25, 2004 |
| № 585 | S15 | W25 | 01 | 0010 | Alpha | Apr 2, 2004 | Apr 9, 2004 | Apr 22, 2004 |
| № 582 | N14 | W33 | 15 | 0140 | Beta | Apr 1, 2004 | Apr 8, 2004 | Apr 22, 2004 |
| № 581 | S05 | W39 | 02 | 0100 | Alpha | Apr 1, 2004 | Apr 8, 2004 | Apr 21, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, April. Gray background - average solar cycle.
