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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1299 | S20 | W02 | 06 | 0040 | Beta | Sep 19, 2011 | Sep 26, 2011 | Oct 10, 2011 |
| № 1298 | N15 | E09 | 03 | 0100 | Beta | Sep 20, 2011 | Sep 27, 2011 | Oct 10, 2011 |
| № 1296 | N25 | E19 | 09 | 0130 | Beta | Sep 20, 2011 | Sep 27, 2011 | Oct 11, 2011 |
| № 1295 | N22 | E04 | 17 | 0210 | Beta | Sep 19, 2011 | Sep 26, 2011 | Oct 10, 2011 |
| № 1294 | S16 | W45 | 01 | 0010 | Alpha | Sep 16, 2011 | Sep 22, 2011 | Oct 6, 2011 |
| № 1292 | N10 | W17 | 01 | 0020 | Alpha | Sep 18, 2011 | Sep 25, 2011 | Oct 8, 2011 |
| № 1291 | N21 | W93 | 02 | 0010 | Beta | Sep 12, 2011 | Sep 19, 2011 | Oct 3, 2011 |
| № 1290 | S13 | W84 | 04 | 0010 | Beta | Sep 13, 2011 | Sep 19, 2011 | Oct 3, 2011 |
| № 1289 | N22 | W67 | 05 | 0380 | Alpha | Sep 14, 2011 | Sep 21, 2011 | Oct 5, 2011 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1982 to September 2011. The gray background is the average SSN index.
