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) | |
|---|---|---|---|---|---|---|---|---|
| № 9435 | S21 | E28 | 04 | 0020 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 14, 2001 |
| № 9434 | N19 | W23 | 04 | 0050 | Beta | Apr 19, 2001 | Apr 26, 2001 | May 10, 2001 |
| № 9433 | N17 | E64 | 17 | 0590 | Beta | Apr 26, 2001 | May 3, 2001 | May 16, 2001 |
| № 9432 | N07 | E06 | 09 | 0050 | Beta | Apr 21, 2001 | Apr 28, 2001 | May 12, 2001 |
| № 9429 | N08 | W04 | 01 | 0060 | Alpha | Apr 21, 2001 | Apr 27, 2001 | May 11, 2001 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1972, January to 2001, April. Gray background - average solar cycle.
