Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9587 | S11 | E58 | 01 | 0020 | Alpha | Aug 23, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9586 | S15 | W45 | 02 | 0020 | Beta | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
| № 9585 | N15 | E65 | 07 | 0060 | Beta | Aug 24, 2001 | Aug 31, 2001 | Sep 13, 2001 |
| № 9584 | S13 | E49 | 05 | 0040 | Beta | Aug 23, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9582 | N30 | E47 | 03 | 0020 | Beta | Aug 23, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9581 | S25 | W40 | 01 | 0020 | Alpha | Aug 16, 2001 | Aug 23, 2001 | Sep 6, 2001 |
| № 9580 | N24 | E37 | 01 | 0090 | Alpha | Aug 22, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9579 | S22 | W48 | 01 | 0020 | Alpha | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
| № 9577 | N15 | W90 | 01 | 0010 | Alpha | Aug 12, 2001 | Aug 19, 2001 | Sep 2, 2001 |
| № 9575 | N11 | W00 | 03 | 0100 | Beta | Aug 19, 2001 | Aug 26, 2001 | Sep 8, 2001 |
| № 9574 | S04 | W88 | 01 | 0040 | Alpha | Aug 12, 2001 | Aug 19, 2001 | Sep 2, 2001 |
| № 9573 | S08 | W47 | 01 | 0030 | Alpha | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
| № 9570 | S10 | W88 | 01 | 0070 | Alpha | Aug 12, 2001 | Aug 19, 2001 | Sep 2, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to August 2001. The gray background is the average SSN index.
