Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2818 | S17 | E62 | 01 | 0090 | Alpha | Apr 27, 2021 | May 4, 2021 | May 18, 2021 |
| № 2817 | N18 | W66 | 13 | 0140 | Beta | Apr 17, 2021 | Apr 24, 2021 | May 8, 2021 |
| № 2816 | S24 | E04 | 10 | 0110 | Beta | Apr 23, 2021 | Apr 30, 2021 | May 13, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to April 2021. The gray background is the average SSN index.
