Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9641 | S14 | E77 | 01 | 0060 | Alpha | Oct 5, 2001 | Oct 12, 2001 | Oct 25, 2001 |
| № 9640 | N10 | E67 | 04 | 0040 | Beta | Oct 4, 2001 | Oct 11, 2001 | Oct 24, 2001 |
| № 9639 | N04 | E21 | 07 | 0030 | Beta | Oct 1, 2001 | Oct 7, 2001 | Oct 21, 2001 |
| № 9638 | N03 | E35 | 01 | 0000 | Alpha | Oct 2, 2001 | Oct 8, 2001 | Oct 22, 2001 |
| № 9637 | S14 | E32 | 10 | 0200 | Beta | Oct 1, 2001 | Oct 8, 2001 | Oct 22, 2001 |
| № 9636 | N13 | E26 | 28 | 0370 | Beta-Gamma | Oct 1, 2001 | Oct 8, 2001 | Oct 21, 2001 |
| № 9635 | N21 | W38 | 10 | 0060 | Beta | Sep 26, 2001 | Oct 3, 2001 | Oct 17, 2001 |
| № 9634 | N12 | E11 | 08 | 0110 | Beta | Sep 30, 2001 | Oct 7, 2001 | Oct 20, 2001 |
| № 9633 | N22 | E10 | 01 | 0070 | Alpha | Sep 30, 2001 | Oct 7, 2001 | Oct 21, 2001 |
| № 9632 | S19 | W21 | 17 | 0710 | Beta-Gamma-Delta | Sep 27, 2001 | Oct 4, 2001 | Oct 18, 2001 |
| № 9628 | S18 | W37 | 37 | 0780 | Beta-Gamma-Delta | Sep 26, 2001 | Oct 3, 2001 | Oct 17, 2001 |
| № 9627 | N00 | W49 | 02 | 0000 | Alpha | Sep 25, 2001 | Oct 2, 2001 | Oct 16, 2001 |
| № 9624 | N03 | W67 | 01 | 0090 | Alpha | Sep 24, 2001 | Oct 1, 2001 | Oct 14, 2001 |
| № 9621 | N14 | W72 | 01 | 0110 | Alpha | Sep 24, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9620 | N12 | W77 | 01 | 0040 | Alpha | Sep 23, 2001 | Sep 30, 2001 | Oct 14, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to September 2001. The gray background is the average SSN index.
