Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 28, 2021. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2821 | S23 | W47 | 05 | 0060 | Beta | Apr 26, 2021 | May 3, 2021 | May 16, 2021 |
| № 2820 | S21 | W36 | 11 | 0070 | Beta | Apr 27, 2021 | May 3, 2021 | May 17, 2021 |
| № 2818 | S17 | W31 | 01 | 0010 | Alpha | Apr 27, 2021 | May 4, 2021 | May 17, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to April 2021. The gray background is the average SSN index.
