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) | |
|---|---|---|---|---|---|---|---|---|
| № 9420 | S08 | E76 | 01 | 0040 | Alpha | Apr 13, 2001 | Apr 20, 2001 | May 3, 2001 |
| № 9419 | N10 | W33 | 01 | 0000 | Alpha | Apr 5, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9418 | N27 | E58 | 08 | 0230 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9417 | S08 | E27 | 13 | 0050 | Beta | Apr 9, 2001 | Apr 16, 2001 | Apr 29, 2001 |
| № 9416 | N17 | W46 | 04 | 0030 | Beta | Apr 4, 2001 | Apr 10, 2001 | Apr 24, 2001 |
| № 9415 | S21 | E47 | 19 | 0710 | Beta-Gamma | Apr 11, 2001 | Apr 18, 2001 | May 1, 2001 |
| № 9414 | S23 | E20 | 01 | 0000 | Alpha | Apr 9, 2001 | Apr 15, 2001 | Apr 29, 2001 |
| № 9413 | N10 | W71 | 06 | 0130 | Beta | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9412 | S14 | W01 | 01 | 0000 | Alpha | Apr 7, 2001 | Apr 14, 2001 | Apr 27, 2001 |
| № 9408 | S09 | W74 | 10 | 0260 | Beta | Apr 1, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9407 | N11 | W41 | 02 | 0090 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N29 | W35 | 03 | 0140 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9401 | N24 | W84 | 04 | 0100 | Beta | Apr 1, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9397 | S09 | W93 | 01 | 0030 | Alpha | Mar 31, 2001 | Apr 7, 2001 | Apr 20, 2001 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1972, January to 2001, April. Gray background - average solar cycle.
