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) | |
|---|---|---|---|---|---|---|---|---|
| № 594 | N15 | E70 | 01 | 0060 | Alpha | Apr 21, 2004 | Apr 28, 2004 | May 12, 2004 |
| № 593 | S20 | E44 | 01 | 0020 | Alpha | Apr 19, 2004 | Apr 26, 2004 | May 10, 2004 |
| № 592 | S12 | E47 | 03 | 0030 | Alpha | Apr 19, 2004 | Apr 26, 2004 | May 10, 2004 |
| № 591 | S16 | W24 | 13 | 0080 | Beta-Gamma-Delta | Apr 14, 2004 | Apr 21, 2004 | May 5, 2004 |
| № 588 | S13 | W91 | 01 | 0040 | Alpha | Apr 9, 2004 | Apr 16, 2004 | Apr 29, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, April. Gray background - average solar cycle.
