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 | S10 | W28 | 05 | 0040 | Beta | Sep 6, 2004 | Sep 13, 2004 | Sep 26, 2004 |
| № 670 | S13 | E20 | 04 | 0010 | Alpha | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 669 | S07 | E20 | 12 | 0050 | Beta | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 668 | S10 | W75 | 01 | 0050 | Alpha | Sep 2, 2004 | Sep 9, 2004 | Sep 23, 2004 |
| № 667 | S11 | E10 | 10 | 0240 | Beta | 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.
