Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1837 | S16 | W30 | 13 | 0100 | Beta | Sep 3, 2013 | Sep 9, 2013 | Sep 23, 2013 |
| № 1836 | N12 | W20 | 08 | 0110 | Alpha | Sep 3, 2013 | Sep 10, 2013 | Sep 24, 2013 |
| № 1835 | S10 | W52 | 03 | 0080 | Alpha | Sep 1, 2013 | Sep 8, 2013 | Sep 21, 2013 |
| № 1834 | N11 | W58 | 10 | 0070 | Beta | Aug 31, 2013 | Sep 7, 2013 | Sep 21, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to September 2013. The gray background is the average SSN index.
