Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 22, 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 | N08 | E74 | 01 | 0050 | Alpha | Apr 29, 2001 | May 6, 2001 | May 19, 2001 |
| № 9436 | S11 | E70 | 01 | 0070 | Alpha | Apr 28, 2001 | May 5, 2001 | May 19, 2001 |
| № 9435 | S20 | W01 | 15 | 0210 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 14, 2001 |
| № 9434 | N20 | W53 | 02 | 0020 | Beta | Apr 19, 2001 | Apr 26, 2001 | May 10, 2001 |
| № 9433 | N16 | E38 | 35 | 0790 | Beta-Gamma | Apr 26, 2001 | May 3, 2001 | May 17, 2001 |
| № 9432 | N08 | W18 | 13 | 0100 | Beta | Apr 22, 2001 | Apr 29, 2001 | May 12, 2001 |
| № 9431 | S11 | W02 | 08 | 0130 | Beta | Apr 23, 2001 | Apr 30, 2001 | May 13, 2001 |
| № 9429 | N08 | W33 | 01 | 0060 | 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.
