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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8686 | S24 | E07 | 04 | 0010 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8685 | S08 | E68 | 02 | 0020 | BETA | Sep 7, 1999 | Sep 14, 1999 | Sep 27, 1999 |
| № 8684 | S12 | E37 | 04 | 0010 | BETA | Sep 5, 1999 | Sep 11, 1999 | Sep 25, 1999 |
| № 8682 | N19 | E39 | 01 | 0010 | ALPHA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8681 | N22 | W29 | 30 | 0260 | BETA-GAMMA | Aug 31, 1999 | Sep 7, 1999 | Sep 20, 1999 |
| № 8679 | S30 | E02 | 03 | 0010 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8677 | N07 | W05 | 02 | 0060 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N20 | W10 | 20 | 0100 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8674 | S23 | W59 | 22 | 0250 | BETA-GAMMA | Aug 28, 1999 | Sep 4, 1999 | Sep 18, 1999 |
| № 8673 | S20 | W74 | 02 | 0170 | ALPHA | Aug 27, 1999 | Sep 3, 1999 | Sep 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
