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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 675 | S08 | E45 | 01 | 0110 | Alpha | Oct 3, 2004 | Oct 9, 2004 | Oct 23, 2004 |
| № 673 | S15 | W91 | 01 | 0200 | Alpha | Sep 22, 2004 | Sep 29, 2004 | Oct 13, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to September 2004. The gray background is the average SSN index.
