Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9427 | S08 | W24 | 05 | 0040 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 2, 2001 |
| № 9426 | S09 | E27 | 08 | 0060 | Beta | Apr 16, 2001 | Apr 23, 2001 | May 6, 2001 |
| № 9424 | S17 | W18 | 12 | 0060 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9423 | N20 | W50 | 03 | 0010 | Beta | Apr 10, 2001 | Apr 17, 2001 | May 1, 2001 |
| № 9422 | S12 | E11 | 06 | 0070 | Beta | Apr 15, 2001 | Apr 21, 2001 | May 5, 2001 |
| № 9420 | S07 | W16 | 01 | 0040 | Alpha | Apr 13, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9418 | N27 | W31 | 04 | 0110 | Beta | Apr 11, 2001 | Apr 18, 2001 | May 2, 2001 |
| № 9417 | S06 | W64 | 08 | 0120 | Beta | Apr 9, 2001 | Apr 16, 2001 | Apr 29, 2001 |
| № 9415 | S22 | W44 | 22 | 0520 | Beta-Gamma-Delta | 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.
