Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 668 | S11 | W33 | 04 | 0020 | Beta | Sep 2, 2004 | Sep 9, 2004 | Sep 23, 2004 |
| № 667 | S11 | E49 | 01 | 0250 | Alpha | Sep 9, 2004 | Sep 15, 2004 | Sep 29, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to September 2004. The gray background is the average SSN index.
