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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8674 | S24 | E68 | 05 | 0180 | BETA | Aug 27, 1999 | Sep 3, 1999 | Sep 17, 1999 |
| № 8673 | S19 | E68 | 02 | 0280 | ALPHA | Aug 27, 1999 | Sep 3, 1999 | Sep 17, 1999 |
| № 8672 | N16 | W29 | 06 | 0020 | BETA | Aug 20, 1999 | Aug 26, 1999 | Sep 9, 1999 |
| № 8668 | N22 | W09 | 12 | 0290 | 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.
