Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 663 | N08 | E75 | 02 | 0110 | Alpha | Aug 27, 2004 | Sep 2, 2004 | Sep 16, 2004 |
| № 662 | N13 | E13 | 11 | 0040 | Beta | Aug 22, 2004 | Aug 29, 2004 | Sep 11, 2004 |
| № 661 | N09 | W06 | 17 | 0510 | Beta-Gamma | 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.
