Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 672 | N05 | E33 | 49 | 0260 | Beta-Gamma | Sep 16, 2004 | Sep 23, 2004 | Oct 7, 2004 |
| № 669 | S06 | W66 | 02 | 0080 | Alpha | Sep 9, 2004 | Sep 16, 2004 | Sep 29, 2004 |
| № 667 | S11 | W72 | 04 | 0230 | Beta | 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.
