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 | E55 | 04 | 0050 | Beta | Apr 11, 2004 | Apr 18, 2004 | May 1, 2004 |
| № 588 | S15 | E26 | 12 | 0170 | Beta-Gamma | Apr 9, 2004 | Apr 16, 2004 | Apr 29, 2004 |
| № 587 | S14 | W30 | 17 | 0140 | Beta | Apr 5, 2004 | Apr 11, 2004 | Apr 25, 2004 |
| № 582 | N14 | W80 | 01 | 0120 | Alpha | Apr 1, 2004 | Apr 8, 2004 | Apr 21, 2004 |
| № 581 | S04 | W82 | 01 | 0040 | 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.
