Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9443 | S10 | E21 | 03 | 0010 | Beta | May 1, 2001 | May 7, 2001 | May 21, 2001 |
| № 9442 | N28 | E47 | 01 | 0060 | Alpha | May 3, 2001 | May 10, 2001 | May 24, 2001 |
| № 9441 | N08 | E38 | 15 | 0150 | Beta | May 2, 2001 | May 9, 2001 | May 22, 2001 |
| № 9440 | N08 | E05 | 06 | 0030 | Beta | Apr 29, 2001 | May 6, 2001 | May 20, 2001 |
| № 9439 | S20 | W55 | 01 | 0020 | Alpha | Apr 25, 2001 | May 2, 2001 | May 15, 2001 |
| № 9437 | N09 | W05 | 05 | 0030 | Beta | Apr 29, 2001 | May 5, 2001 | May 19, 2001 |
| № 9436 | S10 | W06 | 01 | 0160 | Alpha | Apr 29, 2001 | May 5, 2001 | May 19, 2001 |
| № 9435 | S20 | W80 | 03 | 0160 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 14, 2001 |
| № 9433 | N17 | W38 | 45 | 0910 | Beta-Gamma-Delta | Apr 26, 2001 | May 3, 2001 | May 17, 2001 |
| № 9431 | S10 | W85 | 01 | 0000 | Alpha | Apr 23, 2001 | Apr 29, 2001 | May 13, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
