Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9632 | S18 | E76 | 06 | 0390 | Beta | Sep 28, 2001 | Oct 5, 2001 | Oct 18, 2001 |
| № 9631 | N08 | W15 | 09 | 0060 | Beta | Sep 21, 2001 | Sep 28, 2001 | Oct 11, 2001 |
| № 9630 | N27 | W36 | 03 | 0010 | Beta | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9629 | N26 | E23 | 07 | 0060 | Beta | Sep 24, 2001 | Oct 1, 2001 | Oct 15, 2001 |
| № 9628 | S18 | E51 | 33 | 0800 | Beta-Gamma | Sep 26, 2001 | Oct 3, 2001 | Oct 16, 2001 |
| № 9627 | N04 | E43 | 03 | 0040 | Beta | Sep 25, 2001 | Oct 2, 2001 | Oct 16, 2001 |
| № 9626 | N26 | E14 | 07 | 0040 | Beta | Sep 23, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9625 | S28 | W36 | 02 | 0010 | Beta | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9624 | N03 | E29 | 01 | 0100 | Alpha | Sep 24, 2001 | Oct 1, 2001 | Oct 14, 2001 |
| № 9623 | N21 | E04 | 01 | 0000 | Alpha | Sep 22, 2001 | Sep 29, 2001 | Oct 13, 2001 |
| № 9622 | N13 | W05 | 14 | 0060 | Beta | Sep 22, 2001 | Sep 28, 2001 | Oct 12, 2001 |
| № 9621 | N15 | E22 | 10 | 0180 | Beta | Sep 24, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9620 | N12 | E17 | 09 | 0210 | Beta-Gamma | Sep 23, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9619 | N17 | W67 | 03 | 0020 | Beta | Sep 17, 2001 | Sep 24, 2001 | Oct 7, 2001 |
| № 9616 | S12 | W37 | 18 | 0180 | Beta-Gamma | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to September 2001. The gray background is the average SSN index.
