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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 18, 2013. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1847 | N11 | E69 | 01 | 0010 | Alpha | Sep 24, 2013 | Oct 1, 2013 | Oct 14, 2013 |
| № 1846 | S16 | E79 | 01 | 0050 | Alpha | Sep 25, 2013 | Oct 2, 2013 | Oct 15, 2013 |
| № 1845 | S20 | E61 | 01 | 0010 | Alpha | Sep 24, 2013 | Sep 30, 2013 | Oct 14, 2013 |
| № 1844 | N24 | W54 | 01 | 0010 | Alpha | Sep 15, 2013 | Sep 22, 2013 | Oct 6, 2013 |
| № 1843 | N01 | E08 | 04 | 0020 | Beta | Sep 19, 2013 | Sep 26, 2013 | Oct 10, 2013 |
| № 1841 | S04 | W10 | 01 | 0030 | Alpha | Sep 18, 2013 | Sep 25, 2013 | Oct 8, 2013 |
| № 1840 | S11 | W87 | 01 | 0010 | Alpha | Sep 12, 2013 | Sep 19, 2013 | Oct 3, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to September 2013. The gray background is the average SSN index.
