Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 663 | N03 | W88 | 01 | 0050 | Alpha | Aug 26, 2004 | Sep 2, 2004 | Sep 16, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to September 2004. The gray background is the average SSN index.
