Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 18, 2001. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9624 | N03 | E68 | 01 | 0040 | Alpha | Sep 24, 2001 | Oct 1, 2001 | Oct 15, 2001 |
| № 9623 | N21 | E44 | 01 | 0020 | Alpha | Sep 23, 2001 | Sep 29, 2001 | Oct 13, 2001 |
| № 9622 | N12 | E32 | 05 | 0040 | Beta | Sep 22, 2001 | Sep 28, 2001 | Oct 12, 2001 |
| № 9621 | N16 | E60 | 03 | 0130 | Beta | Sep 24, 2001 | Oct 1, 2001 | Oct 14, 2001 |
| № 9620 | N13 | E55 | 02 | 0180 | Alpha | Sep 23, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9619 | N15 | W31 | 02 | 0020 | Beta | Sep 17, 2001 | Sep 24, 2001 | Oct 7, 2001 |
| № 9617 | N08 | E02 | 04 | 0020 | Beta | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9616 | S12 | E01 | 25 | 0270 | Beta-Gamma | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9610 | S12 | W77 | 06 | 0150 | Beta | Sep 13, 2001 | Sep 20, 2001 | Oct 4, 2001 |
| № 9608 | S30 | W77 | 10 | 0420 | Beta-Gamma | Sep 13, 2001 | Sep 20, 2001 | Oct 4, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to September 2001. The gray background is the average SSN index.
