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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8680 | N22 | W91 | 01 | 0000 | ALPHA | Aug 22, 1999 | Aug 29, 1999 | Sep 12, 1999 |
| № 8679 | S31 | E40 | 02 | 0050 | BETA | Sep 1, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8678 | N16 | W71 | 02 | 0010 | BETA | Aug 24, 1999 | Aug 31, 1999 | Sep 13, 1999 |
| № 8677 | N07 | E42 | 06 | 0090 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8676 | N25 | E30 | 07 | 0010 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N19 | E36 | 10 | 0080 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8674 | S24 | W20 | 72 | 0770 | BETA-GAMMA-DELTA | Aug 28, 1999 | Sep 4, 1999 | Sep 18, 1999 |
| № 8673 | S19 | W28 | 14 | 0440 | BETA-GAMMA | Aug 27, 1999 | Sep 3, 1999 | Sep 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
