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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1841 | S04 | E04 | 01 | 0030 | Alpha | Sep 18, 2013 | Sep 25, 2013 | Oct 8, 2013 |
| № 1840 | S11 | W73 | 02 | 0010 | Beta | 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.
