Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9585 | N15 | E74 | 02 | 0030 | Beta | Aug 24, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9584 | S11 | E60 | 02 | 0020 | Beta | Aug 23, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9583 | S23 | E13 | 03 | 0020 | Beta | Aug 19, 2001 | Aug 26, 2001 | Sep 9, 2001 |
| № 9582 | N32 | E59 | 02 | 0030 | Alpha | Aug 23, 2001 | Aug 30, 2001 | Sep 13, 2001 |
| № 9581 | S26 | W23 | 03 | 0050 | Beta | Aug 16, 2001 | Aug 23, 2001 | Sep 6, 2001 |
| № 9580 | N25 | E48 | 01 | 0080 | Alpha | Aug 22, 2001 | Aug 29, 2001 | Sep 12, 2001 |
| № 9579 | S20 | W36 | 04 | 0040 | Beta | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
| № 9578 | S10 | W65 | 01 | 0060 | Alpha | Aug 13, 2001 | Aug 20, 2001 | Sep 2, 2001 |
| № 9577 | N13 | W74 | 03 | 0100 | Beta | Aug 12, 2001 | Aug 19, 2001 | Sep 2, 2001 |
| № 9575 | N12 | E08 | 04 | 0130 | Beta | Aug 19, 2001 | Aug 25, 2001 | Sep 8, 2001 |
| № 9574 | S04 | W79 | 03 | 0150 | Beta | Aug 12, 2001 | Aug 19, 2001 | Sep 1, 2001 |
| № 9573 | S09 | W35 | 01 | 0030 | Alpha | Aug 15, 2001 | Aug 22, 2001 | Sep 5, 2001 |
| № 9571 | N06 | W56 | 01 | 0010 | Alpha | Aug 14, 2001 | Aug 21, 2001 | Sep 3, 2001 |
| № 9570 | S11 | W73 | 01 | 0120 | 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.
