Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 9431 | S10 | E49 | 02 | 0010 | Alpha | Apr 23, 2001 | Apr 29, 2001 | May 13, 2001 |
| № 9430 | S17 | W46 | 06 | 0030 | Beta | Apr 16, 2001 | Apr 22, 2001 | May 6, 2001 |
| № 9429 | N08 | E23 | 01 | 0080 | Alpha | Apr 21, 2001 | Apr 28, 2001 | May 11, 2001 |
| № 9426 | S08 | W40 | 04 | 0010 | Beta | Apr 16, 2001 | Apr 23, 2001 | May 6, 2001 |
| № 9424 | S15 | W85 | 02 | 0020 | Beta | Apr 13, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9422 | S13 | W54 | 03 | 0010 | Beta | Apr 15, 2001 | Apr 22, 2001 | May 5, 2001 |
| № 9420 | S07 | W83 | 01 | 0000 | Alpha | Apr 13, 2001 | Apr 20, 2001 | May 3, 2001 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1972, January to 2001, April. Gray background - average solar cycle.
