Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 17, 2011. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1161 | N13 | E25 | 09 | 0120 | Beta-Gamma | Feb 20, 2011 | Feb 27, 2011 | Mar 12, 2011 |
| № 1158 | S21 | W39 | 19 | 0620 | Beta-Gamma-Delta | Feb 15, 2011 | Feb 22, 2011 | Mar 8, 2011 |
| № 1157 | N19 | W70 | 02 | 0010 | Beta | Feb 13, 2011 | Feb 20, 2011 | Mar 5, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to February 2011. The gray background is the average SSN index.
