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) | |
|---|---|---|---|---|---|---|---|---|
| № 590 | S09 | W69 | 02 | 0020 | Beta | Apr 4, 2004 | Apr 10, 2004 | Apr 24, 2004 |
| № 589 | N11 | E31 | 01 | 0010 | Alpha | Apr 11, 2004 | Apr 18, 2004 | May 2, 2004 |
| № 588 | S17 | E03 | 09 | 0150 | Beta-Gamma | Apr 9, 2004 | Apr 16, 2004 | Apr 30, 2004 |
| № 587 | S13 | W57 | 05 | 0030 | Beta | Apr 5, 2004 | Apr 11, 2004 | Apr 25, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, April. Gray background - average solar cycle.
