Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9417 | S10 | E43 | 01 | 0000 | Alpha | Apr 8, 2001 | Apr 15, 2001 | Apr 29, 2001 |
| № 9416 | N17 | W18 | 06 | 0040 | Beta | Apr 4, 2001 | Apr 10, 2001 | Apr 24, 2001 |
| № 9415 | S22 | E72 | 05 | 0470 | Beta | Apr 11, 2001 | Apr 17, 2001 | May 1, 2001 |
| № 9414 | S23 | E44 | 01 | 0010 | Alpha | Apr 8, 2001 | Apr 15, 2001 | Apr 29, 2001 |
| № 9413 | N11 | W44 | 09 | 0110 | Beta | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9412 | S15 | E25 | 02 | 0010 | Alpha | Apr 7, 2001 | Apr 14, 2001 | Apr 27, 2001 |
| № 9408 | S08 | W46 | 20 | 0360 | Beta-Gamma | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9407 | N13 | W15 | 04 | 0100 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N26 | W09 | 02 | 0160 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9404 | S05 | W31 | 09 | 0030 | Beta | Apr 3, 2001 | Apr 9, 2001 | Apr 23, 2001 |
| № 9401 | N25 | W58 | 06 | 0160 | Beta | Apr 1, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9397 | S07 | W65 | 05 | 0060 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 20, 2001 |
| № 9395 | S12 | W72 | 01 | 0010 | Alpha | Mar 31, 2001 | Apr 6, 2001 | Apr 20, 2001 |
| № 9393 | N18 | W82 | 17 | 1080 | Beta-Gamma-Delta | Mar 30, 2001 | Apr 6, 2001 | Apr 19, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
