Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 21, 2013. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1679 | S14 | E32 | 01 | 0010 | Alpha | Feb 24, 2013 | Mar 3, 2013 | Mar 17, 2013 |
| № 1678 | N11 | W52 | 13 | 0360 | Beta-Gamma-Delta | Feb 18, 2013 | Feb 25, 2013 | Mar 10, 2013 |
| № 1677 | S28 | E28 | 01 | 0010 | Alpha | Feb 24, 2013 | Mar 3, 2013 | Mar 17, 2013 |
| № 1676 | S19 | E28 | 02 | 0050 | Beta | Feb 24, 2013 | Mar 3, 2013 | Mar 17, 2013 |
| № 1675 | N12 | W21 | 01 | 0050 | Alpha | Feb 20, 2013 | Feb 27, 2013 | Mar 13, 2013 |
| № 1673 | S11 | E06 | 16 | 0080 | Beta | Feb 22, 2013 | Mar 1, 2013 | Mar 15, 2013 |
| № 1671 | N16 | W57 | 02 | 0090 | Alpha | Feb 18, 2013 | Feb 24, 2013 | Mar 10, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to February 2013. The gray background is the average SSN index.
