No image for the selected date
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 | E73 | 01 | 0020 | ALPHA | Sep 18, 1999 | Sep 24, 1999 | Oct 8, 1999 |
| № 8694 | S17 | W34 | 02 | 0010 | ALPHA | Sep 9, 1999 | Sep 16, 1999 | Sep 30, 1999 |
| № 8693 | N13 | E37 | 06 | 0050 | BETA | Sep 15, 1999 | Sep 22, 1999 | Oct 5, 1999 |
| № 8692 | S27 | E36 | 22 | 0320 | BETA-GAMMA | Sep 15, 1999 | Sep 22, 1999 | Oct 6, 1999 |
| № 8691 | S31 | W69 | 02 | 0000 | BETA | Sep 7, 1999 | Sep 14, 1999 | Sep 28, 1999 |
| № 8690 | N13 | E20 | 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.
