Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1174 | N22 | W36 | 02 | 0010 | Beta | Mar 16, 2011 | Mar 23, 2011 | Apr 6, 2011 |
| № 1173 | S29 | E26 | 11 | 0060 | Beta | Mar 21, 2011 | Mar 28, 2011 | Apr 11, 2011 |
| № 1169 | N18 | W89 | 02 | 0100 | Alpha | Mar 12, 2011 | Mar 19, 2011 | Apr 2, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to March 2011. The gray background is the average SSN index.
