Sunspots and active regions — April 23, 2021
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 2818 | S17 | E41 | 01 | 0050 | Alpha | Apr 27, 2021 | May 4, 2021 | May 18, 2021 |
| № 2817 | N18 | W86 | 05 | 0140 | Beta | Apr 17, 2021 | Apr 24, 2021 | May 8, 2021 |
| № 2816 | S24 | W16 | 06 | 0050 | Beta | Apr 23, 2021 | Apr 30, 2021 | May 13, 2021 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1992, January to 2021, April. Gray background - average solar cycle.
