Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 671 | S10 | W55 | 17 | 0190 | Beta | Sep 6, 2004 | Sep 13, 2004 | Sep 26, 2004 |
| № 670 | S14 | W07 | 04 | 0010 | Alpha | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 669 | S05 | W09 | 21 | 0090 | Beta | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 667 | S11 | W17 | 03 | 0260 | Alpha | Sep 9, 2004 | Sep 16, 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.
