No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 674 | S10 | W22 | 04 | 0010 | Beta | Sep 20, 2004 | Sep 27, 2004 | Oct 11, 2004 |
| № 673 | S13 | E10 | 18 | 0310 | Beta | Sep 23, 2004 | Sep 29, 2004 | Oct 13, 2004 |
| № 672 | N05 | W70 | 07 | 0080 | Beta | Sep 17, 2004 | Sep 23, 2004 | Oct 7, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to September 2004. The gray background is the average SSN index.
