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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8695 | N19 | E75 | 01 | 0020 | ALPHA | Sep 18, 1999 | Sep 24, 1999 | Oct 8, 1999 |
| № 8694 | S17 | W32 | 02 | 0010 | ALPHA | Sep 9, 1999 | Sep 16, 1999 | Sep 30, 1999 |
| № 8693 | N13 | E39 | 06 | 0050 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S27 | E38 | 22 | 0320 | BETA-GAMMA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8691 | S31 | W67 | 02 | 0000 | BETA | Sep 7, 1999 | Sep 14, 1999 | Sep 28, 1999 |
| № 8690 | N13 | E22 | 14 | 0060 | 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.
