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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8671 | S10 | W43 | 02 | 0020 | ALPHA | Aug 16, 1999 | Aug 23, 1999 | Sep 5, 1999 |
| № 8669 | S21 | W00 | 03 | 0010 | BETA | Aug 19, 1999 | Aug 26, 1999 | Sep 9, 1999 |
| № 8668 | N21 | E28 | 08 | 0380 | BETA | Aug 21, 1999 | Aug 28, 1999 | Sep 11, 1999 |
| № 8667 | N24 | E06 | 03 | 0010 | BETA | Aug 19, 1999 | Aug 26, 1999 | Sep 9, 1999 |
| № 8662 | S16 | W90 | 01 | 0040 | ALPHA | Aug 12, 1999 | Aug 19, 1999 | Sep 2, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
