Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 671 | S11 | W40 | 11 | 0080 | Beta | Sep 6, 2004 | Sep 13, 2004 | Sep 26, 2004 |
| № 670 | S14 | E06 | 14 | 0010 | Beta | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 669 | S06 | E08 | 15 | 0090 | Beta | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 668 | S09 | W88 | 01 | 0010 | Alpha | Sep 2, 2004 | Sep 9, 2004 | Sep 23, 2004 |
| № 667 | S11 | W02 | 04 | 0290 | Alpha | Sep 9, 2004 | Sep 15, 2004 | Sep 29, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, September. Gray background - average solar cycle.
