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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 16, 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 | N14 | E42 | 18 | 0130 | BETA-GAMMA-DELTA | Sep 20, 1999 | Sep 27, 1999 | Oct 11, 1999 |
| № 8699 | N22 | W28 | 23 | 0220 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8695 | N22 | E05 | 03 | 0040 | BETA | Sep 18, 1999 | Sep 25, 1999 | Oct 8, 1999 |
| № 8693 | N13 | W32 | 02 | 0030 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S26 | W30 | 19 | 0160 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8690 | N15 | W51 | 30 | 0300 | 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.
