Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 25, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9438 | S13 | E19 | 01 | 0010 | Alpha | Apr 28, 2001 | May 4, 2001 | May 18, 2001 |
| № 9437 | N09 | E31 | 01 | 0050 | Alpha | Apr 29, 2001 | May 5, 2001 | May 19, 2001 |
| № 9436 | S11 | E29 | 03 | 0150 | Beta | Apr 28, 2001 | May 5, 2001 | May 19, 2001 |
| № 9435 | S19 | W42 | 08 | 0200 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 14, 2001 |
| № 9433 | N17 | W01 | 76 | 1000 | Beta-Gamma-Delta | Apr 26, 2001 | May 3, 2001 | May 17, 2001 |
| № 9432 | N09 | W65 | 03 | 0060 | Beta | Apr 21, 2001 | Apr 28, 2001 | May 12, 2001 |
| № 9431 | S10 | W47 | 02 | 0020 | Alpha | Apr 23, 2001 | Apr 29, 2001 | May 13, 2001 |
| № 9429 | N09 | W74 | 01 | 0030 | Alpha | Apr 21, 2001 | Apr 27, 2001 | May 11, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
