Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2816 | S24 | E61 | 03 | 0080 | Beta | Apr 23, 2021 | Apr 30, 2021 | May 13, 2021 |
| № 2815 | S21 | W19 | 03 | 0010 | Beta | Apr 16, 2021 | Apr 23, 2021 | May 7, 2021 |
| № 2814 | S22 | W42 | 08 | 0020 | Beta | Apr 15, 2021 | Apr 22, 2021 | May 5, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to April 2021. The gray background is the average SSN index.
