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) | |
|---|---|---|---|---|---|---|---|---|
| № 595 | S09 | E56 | 03 | 0010 | Beta | Apr 23, 2004 | Apr 30, 2004 | May 14, 2004 |
| № 594 | N15 | E28 | 04 | 0050 | Alpha | Apr 21, 2004 | Apr 28, 2004 | May 12, 2004 |
| № 592 | S11 | E07 | 01 | 0010 | Alpha | Apr 19, 2004 | Apr 26, 2004 | May 10, 2004 |
| № 591 | S16 | W64 | 07 | 0060 | Beta | Apr 14, 2004 | Apr 21, 2004 | May 5, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, April. Gray background - average solar cycle.
