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) | |
|---|---|---|---|---|---|---|---|---|
| № 589 | N10 | E44 | 03 | 0020 | Alpha | Apr 11, 2004 | Apr 18, 2004 | May 2, 2004 |
| № 588 | S15 | E15 | 15 | 0130 | Beta | Apr 9, 2004 | Apr 16, 2004 | Apr 30, 2004 |
| № 587 | S13 | W44 | 07 | 0070 | Beta | Apr 5, 2004 | Apr 11, 2004 | Apr 25, 2004 |
| № 582 | N14 | W95 | 01 | 0060 | 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.
