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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 3, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8687 | N11 | W06 | 06 | 0020 | BETA | Sep 3, 1999 | Sep 10, 1999 | Sep 24, 1999 |
| № 8686 | S24 | W22 | 08 | 0010 | BETA | Sep 2, 1999 | Sep 9, 1999 | Sep 23, 1999 |
| № 8682 | N18 | E12 | 03 | 0010 | BETA | Sep 5, 1999 | Sep 12, 1999 | Sep 25, 1999 |
| № 8681 | N21 | W56 | 13 | 0160 | BETA | Aug 31, 1999 | Sep 7, 1999 | Sep 20, 1999 |
| № 8679 | S36 | W27 | 01 | 0000 | ALPHA | Sep 2, 1999 | Sep 9, 1999 | Sep 24, 1999 |
| № 8677 | N08 | W34 | 01 | 0040 | ALPHA | Sep 1, 1999 | Sep 8, 1999 | Sep 22, 1999 |
| № 8675 | N19 | W41 | 16 | 0070 | BETA | Sep 1, 1999 | Sep 8, 1999 | Sep 21, 1999 |
| № 8674 | S26 | W86 | 06 | 0060 | BETA | Aug 28, 1999 | Sep 4, 1999 | Sep 18, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
