Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1285 | N29 | W48 | 01 | 0010 | Alpha | Aug 29, 2011 | Sep 5, 2011 | Sep 19, 2011 |
| № 1284 | S17 | W62 | 03 | 0010 | Beta | Aug 28, 2011 | Sep 4, 2011 | Sep 18, 2011 |
| № 1283 | N12 | E61 | 02 | 0100 | Beta | Sep 7, 2011 | Sep 13, 2011 | Sep 27, 2011 |
| № 1282 | N25 | W13 | 09 | 0050 | Beta | Sep 1, 2011 | Sep 8, 2011 | Sep 22, 2011 |
| № 1281 | S20 | E28 | 11 | 0100 | Beta | Sep 4, 2011 | Sep 11, 2011 | Sep 25, 2011 |
| № 1280 | N12 | W37 | 02 | 0010 | Beta | Aug 30, 2011 | Sep 6, 2011 | Sep 20, 2011 |
| № 1279 | N13 | W06 | 01 | 0080 | Alpha | Sep 2, 2011 | Sep 8, 2011 | Sep 22, 2011 |
| № 1277 | N18 | W14 | 01 | 0060 | Alpha | Sep 1, 2011 | Sep 8, 2011 | Sep 22, 2011 |
| № 1274 | N19 | W72 | 01 | 0030 | Alpha | Aug 28, 2011 | Sep 3, 2011 | Sep 17, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to September 2011. The gray background is the average SSN index.
