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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 12, 1999. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8665 | S26 | E62 | 05 | 0050 | BETA | Aug 18, 1999 | Aug 25, 1999 | Sep 8, 1999 |
| № 8662 | S15 | W10 | 39 | 0290 | BETA-GAMMA | Aug 13, 1999 | Aug 19, 1999 | Sep 2, 1999 |
| № 8657 | S31 | W52 | 02 | 0060 | BETA | Aug 9, 1999 | Aug 16, 1999 | Aug 31, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
