Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 688 | S08 | W46 | 06 | 0040 | Beta | Oct 18, 2004 | Oct 25, 2004 | Nov 8, 2004 |
| № 687 | N10 | E67 | 07 | 0160 | Beta-Gamma | Oct 27, 2004 | Nov 3, 2004 | Nov 16, 2004 |
| № 686 | S20 | E19 | 01 | 0020 | Alpha | Oct 23, 2004 | Oct 30, 2004 | Nov 13, 2004 |
| № 685 | S06 | W00 | 13 | 0030 | Beta | Oct 22, 2004 | Oct 29, 2004 | Nov 11, 2004 |
| № 684 | S05 | E29 | 02 | 0030 | Alpha | Oct 24, 2004 | Oct 31, 2004 | Nov 13, 2004 |
| № 683 | S11 | W16 | 10 | 0030 | Beta | Oct 21, 2004 | Oct 27, 2004 | Nov 10, 2004 |
| № 682 | S13 | W31 | 20 | 0150 | Beta-Gamma | Oct 20, 2004 | Oct 26, 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.
