Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9404 | S06 | E64 | 03 | 0070 | Beta | Apr 3, 2001 | Apr 10, 2001 | Apr 23, 2001 |
| № 9403 | S12 | E46 | 04 | 0030 | Beta | Apr 2, 2001 | Apr 8, 2001 | Apr 22, 2001 |
| № 9402 | N14 | W13 | 04 | 0010 | Beta | Mar 28, 2001 | Apr 4, 2001 | Apr 18, 2001 |
| № 9401 | N22 | E28 | 19 | 0200 | Beta | Mar 31, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9400 | N10 | W12 | 03 | 0020 | Beta | Mar 28, 2001 | Apr 4, 2001 | Apr 18, 2001 |
| № 9399 | S29 | W37 | 05 | 0040 | Beta | Mar 26, 2001 | Apr 2, 2001 | Apr 16, 2001 |
| № 9397 | S09 | E33 | 17 | 0200 | Beta | Apr 1, 2001 | Apr 7, 2001 | Apr 21, 2001 |
| № 9396 | S06 | W46 | 15 | 0290 | Beta-Gamma | Mar 26, 2001 | Apr 1, 2001 | Apr 15, 2001 |
| № 9395 | S12 | E19 | 02 | 0050 | Beta | Mar 31, 2001 | Apr 6, 2001 | Apr 20, 2001 |
| № 9394 | N09 | E07 | 01 | 0010 | Alpha | Mar 30, 2001 | Apr 5, 2001 | Apr 19, 2001 |
| № 9393 | N17 | E09 | 55 | 1590 | Beta-Gamma-Delta | Mar 30, 2001 | Apr 6, 2001 | Apr 19, 2001 |
| № 9390 | N14 | W24 | 09 | 0110 | Beta | Mar 27, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9389 | S12 | W13 | 13 | 0080 | Beta | Mar 28, 2001 | Apr 4, 2001 | Apr 18, 2001 |
| № 9387 | N09 | W54 | 01 | 0130 | 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.
