Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 20, 2004. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 596 | S09 | E42 | 21 | 0290 | Beta | Apr 24, 2004 | May 1, 2004 | May 15, 2004 |
| № 595 | S07 | E25 | 25 | 0080 | Beta | Apr 23, 2004 | Apr 30, 2004 | May 13, 2004 |
| № 594 | N15 | W02 | 01 | 0010 | Alpha | Apr 21, 2004 | Apr 28, 2004 | May 11, 2004 |
| № 593 | S18 | W26 | 10 | 0050 | Beta | Apr 19, 2004 | Apr 26, 2004 | May 10, 2004 |
| № 592 | S10 | W23 | 01 | 0010 | Alpha | Apr 19, 2004 | Apr 26, 2004 | May 10, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to April 2004. The gray background is the average SSN index.
