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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 6, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8689 | N18 | W07 | 06 | 0020 | BETA | Sep 7, 1999 | Sep 13, 1999 | Sep 27, 1999 |
| № 8687 | N10 | W50 | 05 | 0030 | BETA | Sep 3, 1999 | Sep 10, 1999 | Sep 24, 1999 |
| № 8686 | S25 | W66 | 02 | 0010 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8684 | S14 | W29 | 01 | 0000 | ALPHA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8682 | N18 | W30 | 15 | 0060 | BETA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8677 | N10 | W76 | 01 | 0040 | ALPHA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N21 | W84 | 01 | 0070 | ALPHA | Sep 1, 1999 | Sep 8, 1999 | Sep 21, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
