Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 2, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9413 | N09 | W17 | 04 | 0020 | Beta | Apr 2, 2001 | Apr 9, 2001 | Apr 22, 2001 |
| № 9412 | S14 | E51 | 03 | 0040 | Beta | Apr 7, 2001 | Apr 14, 2001 | Apr 27, 2001 |
| № 9411 | N08 | E21 | 02 | 0000 | Beta | Apr 5, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9410 | S36 | E18 | 01 | 0000 | Alpha | Apr 4, 2001 | Apr 12, 2001 | Apr 26, 2001 |
| № 9408 | S10 | W18 | 34 | 0340 | Beta-Gamma | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9407 | N11 | E13 | 07 | 0110 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N25 | E16 | 03 | 0160 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9404 | S06 | W04 | 22 | 0080 | Beta | Apr 3, 2001 | Apr 9, 2001 | Apr 23, 2001 |
| № 9403 | S15 | W22 | 03 | 0010 | Beta | Apr 1, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9401 | N20 | W39 | 19 | 0180 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9397 | S08 | W36 | 16 | 0090 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9395 | S13 | W46 | 01 | 0020 | Alpha | Mar 31, 2001 | Apr 6, 2001 | Apr 20, 2001 |
| № 9393 | N16 | W56 | 53 | 1700 | Beta-Gamma-Delta | Mar 30, 2001 | Apr 6, 2001 | Apr 19, 2001 |
| № 9390 | N11 | W91 | 01 | 0030 | Alpha | Mar 27, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9389 | S12 | W86 | 01 | 0050 | Alpha | Mar 28, 2001 | Apr 3, 2001 | Apr 17, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to April 2001. The gray background is the average SSN index.
