Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 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) | |
|---|---|---|---|---|---|---|---|---|
| № 684 | S04 | E63 | 01 | 0030 | Alpha | Oct 24, 2004 | Oct 31, 2004 | Nov 13, 2004 |
| № 683 | S09 | E20 | 06 | 0030 | Beta | Oct 21, 2004 | Oct 27, 2004 | Nov 10, 2004 |
| № 682 | S14 | E08 | 14 | 0150 | Beta | Oct 20, 2004 | Oct 27, 2004 | Nov 9, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to October 2004. The gray background is the average SSN index.
