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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8662 | S16 | E61 | 06 | 0020 | BETA | Aug 13, 1999 | Aug 19, 1999 | Sep 2, 1999 |
| № 8661 | S14 | W11 | 03 | 0010 | BETA | Aug 7, 1999 | Aug 14, 1999 | Aug 28, 1999 |
| № 8660 | S34 | W52 | 02 | 0000 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8657 | S30 | E17 | 11 | 0100 | BETA | Aug 9, 1999 | Aug 16, 1999 | Aug 31, 1999 |
| № 8656 | N18 | W32 | 14 | 0030 | BETA | Aug 5, 1999 | Aug 12, 1999 | Aug 26, 1999 |
| № 8655 | N22 | W22 | 02 | 0010 | ALPHA | Aug 6, 1999 | Aug 13, 1999 | Aug 27, 1999 |
| № 8651 | N26 | W56 | 32 | 0720 | BETA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N17 | W55 | 01 | 0030 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 24, 1999 |
| № 8645 | S28 | W91 | 03 | 0110 | ALPHA | Aug 1, 1999 | Aug 8, 1999 | Aug 22, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
