Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9390 | N14 | E73 | 02 | 0040 | Beta | Mar 28, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9389 | S12 | E75 | 01 | 0030 | Alpha | Mar 28, 2001 | Apr 3, 2001 | Apr 17, 2001 |
| № 9388 | N14 | W49 | 03 | 0030 | Beta | Mar 18, 2001 | Mar 25, 2001 | Apr 8, 2001 |
| № 9387 | N10 | E47 | 05 | 0090 | Beta | Mar 26, 2001 | Apr 1, 2001 | Apr 15, 2001 |
| № 9384 | N14 | W74 | 04 | 0080 | Beta | Mar 16, 2001 | Mar 23, 2001 | Apr 6, 2001 |
| № 9373 | S07 | W71 | 23 | 0270 | Beta-Gamma | Mar 17, 2001 | Mar 23, 2001 | Apr 6, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to March 2001. The gray background is the average SSN index.
