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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 12, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8699 | N21 | E31 | 13 | 0030 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8698 | S16 | E66 | 02 | 0010 | ALPHA | Sep 18, 1999 | Sep 25, 1999 | Oct 8, 1999 |
| № 8697 | S20 | W04 | 03 | 0010 | BETA | Sep 13, 1999 | Sep 19, 1999 | Oct 3, 1999 |
| № 8696 | N14 | W46 | 02 | 0010 | BETA | Sep 9, 1999 | Sep 16, 1999 | Sep 30, 1999 |
| № 8695 | N20 | E62 | 01 | 0040 | ALPHA | Sep 18, 1999 | Sep 24, 1999 | Oct 8, 1999 |
| № 8693 | N13 | E25 | 05 | 0050 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S27 | E25 | 16 | 0270 | BETA-GAMMA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8690 | N14 | E08 | 23 | 0100 | BETA | Sep 13, 1999 | Sep 20, 1999 | Oct 4, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
