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) | |
|---|---|---|---|---|---|---|---|---|
| № 587 | S13 | E39 | 22 | 0200 | beta | Apr 4, 2004 | Apr 11, 2004 | Apr 24, 2004 |
| № 585 | S15 | E01 | 03 | 0010 | beta | Apr 1, 2004 | Apr 8, 2004 | Apr 21, 2004 |
| № 582 | N14 | W07 | 28 | 0250 | beta-gamma | Mar 31, 2004 | Apr 7, 2004 | Apr 21, 2004 |
| № 581 | S05 | W13 | 02 | 0100 | alpha | Mar 31, 2004 | Apr 7, 2004 | Apr 20, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, April. Gray background - average solar cycle.
