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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 1733 | S16 | W28 | 03 | 0030 | Beta | Apr 27, 2013 | May 4, 2013 | May 17, 2013 |
| № 1732 | S15 | E68 | 01 | 0020 | Alpha | May 4, 2013 | May 11, 2013 | May 24, 2013 |
| № 1731 | N09 | E39 | 17 | 0420 | Beta-Gamma | May 2, 2013 | May 9, 2013 | May 22, 2013 |
| № 1730 | S18 | E09 | 15 | 0150 | Beta | Apr 30, 2013 | May 6, 2013 | May 20, 2013 |
| № 1728 | N19 | E13 | 03 | 0020 | Alpha | Apr 30, 2013 | May 7, 2013 | May 20, 2013 |
| № 1727 | N25 | W50 | 01 | 0010 | Alpha | Apr 25, 2013 | May 2, 2013 | May 16, 2013 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1984 to April 2013. The gray background is the average SSN index.
