Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2810 | N17 | E66 | 02 | 0030 | Alpha | Mar 23, 2021 | Mar 30, 2021 | Apr 12, 2021 |
| № 2808 | N19 | W17 | 01 | 0010 | Alpha | Mar 17, 2021 | Mar 23, 2021 | Apr 6, 2021 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1992 to March 2021. The gray background is the average SSN index.
