Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9621 | N16 | E78 | 01 | 0120 | Alpha | Sep 24, 2001 | Oct 1, 2001 | Oct 14, 2001 |
| № 9620 | N12 | E72 | 03 | 0130 | Alpha | Sep 23, 2001 | Sep 30, 2001 | Oct 14, 2001 |
| № 9619 | N17 | W16 | 07 | 0030 | Beta | Sep 17, 2001 | Sep 23, 2001 | Oct 7, 2001 |
| № 9618 | S21 | W66 | 04 | 0020 | Beta | Sep 13, 2001 | Sep 20, 2001 | Oct 3, 2001 |
| № 9617 | N13 | E19 | 04 | 0040 | Beta | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9616 | S12 | E18 | 29 | 0280 | Beta-Gamma | Sep 19, 2001 | Sep 26, 2001 | Oct 10, 2001 |
| № 9612 | N17 | W78 | 02 | 0060 | Beta | Sep 12, 2001 | Sep 19, 2001 | Oct 2, 2001 |
| № 9610 | S12 | W57 | 14 | 0240 | Beta | Sep 14, 2001 | Sep 20, 2001 | Oct 4, 2001 |
| № 9608 | S29 | W62 | 15 | 0550 | 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.
