Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9425 | S25 | W41 | 04 | 0030 | Beta | Apr 9, 2001 | Apr 16, 2001 | Apr 30, 2001 |
| № 9424 | S17 | E06 | 02 | 0020 | Alpha | Apr 13, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9423 | N19 | W26 | 02 | 0010 | Alpha | Apr 10, 2001 | Apr 17, 2001 | May 1, 2001 |
| № 9422 | S13 | E35 | 02 | 0050 | Alpha | Apr 15, 2001 | Apr 22, 2001 | May 5, 2001 |
| № 9420 | S07 | E08 | 03 | 0050 | Beta | Apr 13, 2001 | Apr 20, 2001 | May 3, 2001 |
| № 9419 | N08 | W90 | 01 | 0000 | Alpha | Apr 5, 2001 | Apr 12, 2001 | Apr 26, 2001 |
| № 9418 | N26 | W09 | 13 | 0190 | Beta | Apr 11, 2001 | Apr 18, 2001 | May 2, 2001 |
| № 9417 | S08 | W41 | 13 | 0090 | Beta | Apr 9, 2001 | Apr 16, 2001 | Apr 29, 2001 |
| № 9415 | S23 | W21 | 40 | 0490 | Beta-Gamma-Delta | Apr 11, 2001 | Apr 17, 2001 | May 1, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
