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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8684 | S12 | E45 | 02 | 0000 | ALPHA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8683 | S10 | E33 | 01 | 0000 | ALPHA | Sep 4, 1999 | Sep 11, 1999 | Sep 24, 1999 |
| № 8682 | N18 | E47 | 02 | 0020 | BETA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8681 | N21 | W21 | 28 | 0280 | BETA-GAMMA | Aug 31, 1999 | Sep 7, 1999 | Sep 20, 1999 |
| № 8679 | S33 | E05 | 04 | 0010 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8677 | N07 | E03 | 03 | 0070 | BETA | Sep 2, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8676 | N27 | W08 | 04 | 0010 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N19 | W03 | 21 | 0170 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8674 | S24 | W55 | 45 | 0480 | BETA-GAMMA-DELTA | Aug 28, 1999 | Sep 4, 1999 | Sep 18, 1999 |
| № 8673 | S19 | W68 | 02 | 0270 | ALPHA | 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.
