Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 1, 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 | E67 | 02 | 0050 | Alpha | Apr 7, 2001 | Apr 14, 2001 | Apr 27, 2001 |
| № 9411 | N08 | E37 | 01 | 0000 | Alpha | Apr 5, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9410 | S36 | E28 | 01 | 0000 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 26, 2001 |
| № 9408 | S10 | W03 | 25 | 0250 | Beta | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9407 | N11 | E28 | 03 | 0100 | Beta | Apr 4, 2001 | Apr 11, 2001 | Apr 24, 2001 |
| № 9406 | N25 | E30 | 02 | 0150 | Alpha | Apr 4, 2001 | Apr 11, 2001 | Apr 25, 2001 |
| № 9404 | S06 | E11 | 14 | 0090 | Beta | Apr 3, 2001 | Apr 9, 2001 | Apr 23, 2001 |
| № 9403 | S15 | W04 | 05 | 0010 | Beta | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9402 | N20 | W55 | 03 | 0020 | Beta | Mar 29, 2001 | Apr 5, 2001 | Apr 18, 2001 |
| № 9401 | N20 | W23 | 32 | 0190 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9397 | S09 | W20 | 17 | 0120 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9395 | S12 | W30 | 02 | 0030 | Alpha | Mar 31, 2001 | Apr 6, 2001 | Apr 20, 2001 |
| № 9393 | N17 | W41 | 62 | 2000 | Beta-Gamma-Delta | Mar 30, 2001 | Apr 6, 2001 | Apr 19, 2001 |
| № 9390 | N14 | W75 | 01 | 0040 | Alpha | Mar 27, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9389 | S11 | W73 | 06 | 0050 | Beta | Mar 27, 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.
