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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8088 | S29 | W28 | 12 | 0240 | BETA | Sep 27, 1997 | Oct 4, 1997 | Oct 18, 1997 |
| № 8087 | S25 | E08 | 01 | 0000 | ALPHA | Sep 29, 1997 | Oct 6, 1997 | Oct 20, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to September 1997. The gray background is the average SSN index.
