Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 13, 2007. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 951 | S12 | E55 | 01 | 0010 | Alpha | Apr 18, 2007 | Apr 25, 2007 | May 9, 2007 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1978 to April 2007. The gray background is the average SSN index.
