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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1924 | S12 | W73 | 02 | 0020 | Beta | Dec 8, 2013 | Dec 15, 2013 | Dec 29, 2013 |
| № 1923 | N18 | E02 | 09 | 0010 | Beta | Dec 14, 2013 | Dec 21, 2013 | Jan 4, 2014 |
| № 1922 | N10 | W45 | 09 | 0090 | Beta | Dec 11, 2013 | Dec 17, 2013 | Dec 31, 2013 |
| № 1921 | N08 | E37 | 02 | 0360 | Alpha | Dec 17, 2013 | Dec 24, 2013 | Jan 6, 2014 |
| № 1920 | N13 | E31 | 02 | 0080 | Alpha | Dec 16, 2013 | Dec 23, 2013 | Jan 6, 2014 |
| № 1919 | S06 | W65 | 02 | 0010 | Alpha | Dec 9, 2013 | Dec 16, 2013 | Dec 29, 2013 |
| № 1918 | S08 | E25 | 13 | 0180 | Beta-Gamma | Dec 16, 2013 | Dec 23, 2013 | Jan 5, 2014 |
| № 1917 | S15 | E04 | 12 | 0190 | Beta | Dec 14, 2013 | Dec 21, 2013 | Jan 4, 2014 |
| № 1916 | S13 | W90 | 04 | 0120 | Beta | Dec 7, 2013 | Dec 14, 2013 | Dec 28, 2013 |
| № 1912 | S21 | W64 | 01 | 0080 | Alpha | Dec 9, 2013 | Dec 16, 2013 | Dec 30, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to December 2013. The gray background is the average SSN index.
