Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9359 | N10 | E74 | 03 | 0080 | Beta | Feb 28, 2001 | Mar 6, 2001 | Mar 20, 2001 |
| № 9358 | S08 | E20 | 09 | 0050 | Beta | Feb 24, 2001 | Mar 2, 2001 | Mar 16, 2001 |
| № 9357 | S26 | E06 | 02 | 0020 | Beta | Feb 22, 2001 | Mar 1, 2001 | Mar 15, 2001 |
| № 9354 | S08 | W20 | 18 | 0150 | Beta | Feb 20, 2001 | Feb 27, 2001 | Mar 13, 2001 |
| № 9353 | S22 | W36 | 04 | 0040 | Beta | Feb 19, 2001 | Feb 26, 2001 | Mar 12, 2001 |
| № 9352 | S21 | E02 | 01 | 0010 | Alpha | Feb 22, 2001 | Mar 1, 2001 | Mar 15, 2001 |
| № 9350 | N19 | W50 | 01 | 0060 | Alpha | Feb 18, 2001 | Feb 25, 2001 | Mar 11, 2001 |
| № 9349 | N30 | W69 | 01 | 0020 | Alpha | Feb 17, 2001 | Feb 24, 2001 | Mar 10, 2001 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1972 to February 2001. The gray background is the average SSN index.
