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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8086 | N28 | E36 | 05 | 0080 | BETA | Sep 19, 1997 | Sep 26, 1997 | Oct 10, 1997 |
| № 8085 | S26 | W27 | 16 | 0380 | BETA | Sep 14, 1997 | Sep 21, 1997 | Oct 5, 1997 |
| № 8084 | N22 | W55 | 12 | 0270 | BETA-GAMMA | Sep 12, 1997 | Sep 19, 1997 | Oct 3, 1997 |
| № 8083 | S27 | W87 | 01 | 0060 | ALPHA | Sep 9, 1997 | Sep 16, 1997 | Sep 30, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to September 1997. The gray background is the average SSN index.
