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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 21, 1997. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8044 | S36 | E66 | 02 | 0030 | ALPHA | May 27, 1997 | Jun 3, 1997 | Jun 18, 1997 |
| № 8043 | N28 | W51 | 10 | 0030 | BETA | May 18, 1997 | May 25, 1997 | Jun 8, 1997 |
| № 8040 | N05 | E02 | 15 | 0090 | BETA | May 22, 1997 | May 29, 1997 | Jun 11, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to May 1997. The gray background is the average SSN index.
