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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1173 | S28 | E39 | 10 | 0040 | Beta | Mar 21, 2011 | Mar 28, 2011 | Apr 11, 2011 |
| № 1172 | N11 | E02 | 01 | 0000 | Alpha | Mar 18, 2011 | Mar 25, 2011 | Apr 8, 2011 |
| № 1169 | N17 | W75 | 09 | 0260 | Beta-Gamma | 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.
