Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9412 | S14 | E81 | 02 | 0030 | Beta | Apr 7, 2001 | Apr 14, 2001 | Apr 27, 2001 |
| № 9411 | N07 | E51 | 02 | 0020 | Alpha | Apr 5, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9410 | S36 | E40 | 02 | 0010 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 26, 2001 |
| № 9408 | S09 | E13 | 28 | 0200 | Beta | Apr 2, 2001 | Apr 9, 2001 | Apr 22, 2001 |
| № 9407 | N11 | E43 | 05 | 0100 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N26 | E43 | 01 | 0170 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9404 | S05 | E25 | 07 | 0080 | Beta | Apr 3, 2001 | Apr 10, 2001 | Apr 23, 2001 |
| № 9403 | S13 | E08 | 02 | 0010 | Beta | Apr 1, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9401 | N21 | W09 | 37 | 0230 | Beta-Gamma | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9397 | S09 | W04 | 23 | 0180 | Beta-Gamma | Apr 1, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9396 | S06 | W83 | 05 | 0140 | Beta | Mar 26, 2001 | Apr 1, 2001 | Apr 15, 2001 |
| № 9395 | S13 | W15 | 02 | 0050 | Alpha | Mar 31, 2001 | Apr 7, 2001 | Apr 20, 2001 |
| № 9393 | N17 | W28 | 63 | 2240 | Beta-Gamma-Delta | Mar 30, 2001 | Apr 6, 2001 | Apr 19, 2001 |
| № 9390 | N13 | W63 | 01 | 0050 | Alpha | Mar 27, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9389 | S10 | W61 | 08 | 0050 | Beta | Mar 27, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9387 | N08 | W90 | 01 | 0060 | Alpha | Mar 25, 2001 | Apr 1, 2001 | Apr 14, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to March 2001. The gray background is the average SSN index.
