Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9590 | S28 | E82 | 01 | 0150 | Alpha | Aug 28, 2001 | Sep 4, 2001 | Sep 18, 2001 |
| № 9589 | N15 | W19 | 04 | 0010 | Beta | Aug 20, 2001 | Aug 27, 2001 | Sep 10, 2001 |
| № 9588 | S32 | W68 | 04 | 0090 | Beta | Aug 16, 2001 | Aug 24, 2001 | Sep 7, 2001 |
| № 9587 | S11 | E17 | 01 | 0010 | Alpha | Aug 23, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9585 | N15 | E24 | 22 | 0250 | Beta | Aug 24, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9584 | S12 | E07 | 02 | 0010 | Alpha | Aug 22, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9582 | N28 | E07 | 22 | 0130 | Beta | Aug 22, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9581 | S26 | W75 | 03 | 0010 | Beta | Aug 16, 2001 | Aug 23, 2001 | Sep 6, 2001 |
| № 9580 | N25 | W03 | 01 | 0100 | Alpha | Aug 22, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9575 | N10 | W44 | 01 | 0110 | Alpha | Aug 19, 2001 | Aug 25, 2001 | Sep 8, 2001 |
| № 9573 | S08 | W85 | 01 | 0030 | Alpha | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to August 2001. The gray background is the average SSN index.
