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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 8, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8693 | N12 | E81 | 01 | 0020 | ALPHA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S25 | E76 | 06 | 0090 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8691 | S30 | W30 | 06 | 0030 | BETA | Sep 6, 1999 | Sep 14, 1999 | Sep 28, 1999 |
| № 8690 | N13 | E62 | 05 | 0080 | BETA-GAMMA | Sep 14, 1999 | Sep 20, 1999 | Oct 4, 1999 |
| № 8689 | N19 | W30 | 05 | 0020 | BETA | Sep 7, 1999 | Sep 13, 1999 | Sep 27, 1999 |
| № 8687 | N12 | W71 | 07 | 0020 | BETA | Sep 3, 1999 | Sep 10, 1999 | Sep 24, 1999 |
| № 8682 | N18 | W53 | 11 | 0040 | BETA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
