Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9429 | N09 | E62 | 01 | 0080 | Alpha | Apr 21, 2001 | Apr 27, 2001 | May 11, 2001 |
| № 9428 | N14 | W39 | 03 | 0010 | Beta | Apr 13, 2001 | Apr 20, 2001 | May 4, 2001 |
| № 9427 | S08 | W52 | 05 | 0030 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 2, 2001 |
| № 9426 | S10 | W02 | 04 | 0020 | Beta | Apr 16, 2001 | Apr 23, 2001 | May 6, 2001 |
| № 9424 | S18 | W46 | 04 | 0010 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9422 | S12 | W17 | 08 | 0040 | Beta-Gamma | Apr 15, 2001 | Apr 22, 2001 | May 5, 2001 |
| № 9420 | S07 | W44 | 04 | 0010 | Alpha | Apr 13, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9418 | N26 | W59 | 07 | 0200 | Beta-Gamma | Apr 11, 2001 | Apr 18, 2001 | May 2, 2001 |
| № 9417 | S05 | W92 | 04 | 0090 | Beta-Gamma | Apr 9, 2001 | Apr 16, 2001 | Apr 29, 2001 |
| № 9415 | S22 | W72 | 09 | 0360 | Beta-Gamma | Apr 10, 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.
