Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 661 | N07 | E34 | 04 | 0470 | Beta-Delta | Aug 21, 2004 | Aug 27, 2004 | Sep 10, 2004 |
| № 660 | S07 | W10 | 01 | 0010 | Alpha | Aug 17, 2004 | Aug 24, 2004 | Sep 7, 2004 |
| № 656 | S13 | W61 | 33 | 1330 | Beta-Gamma-Delta | Aug 13, 2004 | Aug 20, 2004 | Sep 3, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to August 2004. The gray background is the average SSN index.
