Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9437 | N10 | E63 | 01 | 0060 | Alpha | Apr 29, 2001 | May 5, 2001 | May 19, 2001 |
| № 9436 | S10 | E61 | 01 | 0100 | Alpha | Apr 28, 2001 | May 5, 2001 | May 19, 2001 |
| № 9435 | S20 | W10 | 14 | 0250 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 14, 2001 |
| № 9434 | N17 | W65 | 01 | 0010 | Alpha | Apr 19, 2001 | Apr 26, 2001 | May 9, 2001 |
| № 9433 | N17 | E28 | 47 | 0760 | Beta-Gamma-Delta | Apr 26, 2001 | May 3, 2001 | May 17, 2001 |
| № 9432 | N08 | W32 | 12 | 0090 | Beta | Apr 21, 2001 | Apr 28, 2001 | May 12, 2001 |
| № 9431 | S11 | W13 | 07 | 0060 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 13, 2001 |
| № 9429 | N08 | W43 | 01 | 0050 | Alpha | Apr 21, 2001 | Apr 27, 2001 | May 11, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
