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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8700 | N12 | E83 | 02 | 0030 | ALPHA | Sep 20, 1999 | Sep 27, 1999 | Oct 11, 1999 |
| № 8699 | N21 | E17 | 17 | 0110 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8695 | N20 | E50 | 01 | 0030 | ALPHA | Sep 18, 1999 | Sep 25, 1999 | Oct 8, 1999 |
| № 8693 | N13 | E13 | 02 | 0050 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S26 | E13 | 19 | 0230 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8690 | N14 | W04 | 25 | 0090 | BETA | Sep 14, 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.
