Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 2018. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2706 | N04 | E58 | 04 | 0040 | Beta | Apr 26, 2018 | May 3, 2018 | May 17, 2018 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1989 to April 2018. The gray background is the average SSN index.
