Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 664 | S11 | E40 | 09 | 0030 | Beta | Aug 25, 2004 | Sep 1, 2004 | Sep 14, 2004 |
| № 663 | N10 | E67 | 07 | 0230 | Beta | Aug 27, 2004 | Sep 3, 2004 | Sep 16, 2004 |
| № 662 | N13 | W00 | 13 | 0110 | Beta | Aug 22, 2004 | Aug 29, 2004 | Sep 11, 2004 |
| № 661 | N08 | W19 | 16 | 0470 | Beta | Aug 21, 2004 | Aug 27, 2004 | Sep 10, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to August 2004. The gray background is the average SSN index.
