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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 673 | S13 | E54 | 19 | 0320 | Beta | Sep 23, 2004 | Sep 30, 2004 | Oct 13, 2004 |
| № 672 | N05 | W26 | 37 | 0150 | Beta | Sep 17, 2004 | Sep 24, 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.
