Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9420 | S06 | E59 | 02 | 0070 | Alpha | Apr 13, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9418 | N27 | E42 | 08 | 0200 | Beta | Apr 12, 2001 | Apr 19, 2001 | May 3, 2001 |
| № 9417 | S08 | E11 | 13 | 0180 | Beta | Apr 9, 2001 | Apr 16, 2001 | Apr 29, 2001 |
| № 9415 | S21 | E30 | 11 | 0860 | Beta-Gamma | Apr 11, 2001 | Apr 17, 2001 | May 1, 2001 |
| № 9413 | N10 | W89 | 01 | 0100 | Alpha | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9412 | S16 | W16 | 02 | 0010 | Beta | Apr 7, 2001 | Apr 14, 2001 | Apr 28, 2001 |
| № 9408 | S09 | W91 | 02 | 0160 | Alpha | Apr 1, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9407 | N11 | W57 | 03 | 0050 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N28 | W53 | 04 | 0160 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
