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 | S16 | W12 | 11 | 0140 | Beta | Apr 9, 2004 | Apr 16, 2004 | Apr 30, 2004 |
| № 587 | S13 | W71 | 02 | 0020 | Alpha | 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.
