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 | W54 | 17 | 0190 | Beta | Sep 6, 2004 | Sep 13, 2004 | Sep 26, 2004 |
| № 670 | S14 | W06 | 04 | 0010 | Alpha | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 669 | S05 | W08 | 21 | 0090 | Beta | Sep 9, 2004 | Sep 16, 2004 | Sep 30, 2004 |
| № 667 | S11 | W16 | 03 | 0260 | Alpha | Sep 9, 2004 | Sep 16, 2004 | Sep 29, 2004 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1975, January to 2004, September. Gray background - average solar cycle.
