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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8074 | N26 | E65 | 01 | 0030 | ALPHA | Aug 19, 1997 | Aug 26, 1997 | Sep 9, 1997 |
| № 8073 | N15 | E63 | 01 | 0070 | ALPHA | Aug 19, 1997 | Aug 25, 1997 | Sep 8, 1997 |
| № 8071 | N26 | E09 | 08 | 0030 | BETA | Aug 15, 1997 | Aug 22, 1997 | Sep 5, 1997 |
| № 8070 | S20 | W40 | 07 | 0010 | BETA | Aug 11, 1997 | Aug 18, 1997 | Aug 31, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to August 1997. The gray background is the average SSN index.
