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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8083 | S28 | E53 | 04 | 0070 | BETA | Sep 9, 1997 | Sep 16, 1997 | Sep 30, 1997 |
| № 8081 | N34 | E35 | 04 | 0020 | ALPHA | Sep 8, 1997 | Sep 15, 1997 | Sep 30, 1997 |
| № 8076 | N28 | W57 | 17 | 0160 | BETA | Sep 1, 1997 | Sep 8, 1997 | Sep 22, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to September 1997. The gray background is the average SSN index.
