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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 2, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8686 | S24 | W11 | 05 | 0020 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8682 | N18 | E24 | 05 | 0020 | BETA | Sep 5, 1999 | Sep 12, 1999 | Sep 26, 1999 |
| № 8681 | N21 | W45 | 19 | 0190 | BETA-GAMMA | Aug 31, 1999 | Sep 7, 1999 | Sep 20, 1999 |
| № 8679 | S36 | W19 | 01 | 0010 | ALPHA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8677 | N08 | W23 | 01 | 0040 | ALPHA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N19 | W27 | 16 | 0100 | BETA-GAMMA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8674 | S24 | W75 | 09 | 0150 | BETA-GAMMA | Aug 28, 1999 | Sep 4, 1999 | Sep 18, 1999 |
| № 8673 | S19 | W96 | 01 | 0210 | ALPHA | Aug 27, 1999 | Sep 3, 1999 | Sep 16, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
