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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 20, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8673 | S17 | E83 | 01 | 0100 | ALPHA | Aug 27, 1999 | Sep 3, 1999 | Sep 17, 1999 |
| № 8672 | N15 | W15 | 12 | 0040 | BETA | Aug 20, 1999 | Aug 27, 1999 | Sep 9, 1999 |
| № 8671 | S10 | W71 | 01 | 0000 | ALPHA | Aug 15, 1999 | Aug 22, 1999 | Sep 5, 1999 |
| № 8668 | N22 | E03 | 14 | 0350 | BETA | Aug 21, 1999 | Aug 28, 1999 | Sep 11, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
