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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8657 | S32 | E72 | 01 | 0040 | ALPHA | Aug 10, 1999 | Aug 17, 1999 | Aug 31, 1999 |
| № 8656 | N17 | E21 | 08 | 0020 | BETA | Aug 6, 1999 | Aug 12, 1999 | Aug 26, 1999 |
| № 8655 | N25 | E24 | 01 | 0000 | ALPHA | Aug 6, 1999 | Aug 13, 1999 | Aug 27, 1999 |
| № 8654 | N20 | W45 | 04 | 0010 | BETA | Jul 31, 1999 | Aug 7, 1999 | Aug 21, 1999 |
| № 8651 | N25 | W03 | 43 | 1370 | BETA-GAMMA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N18 | W03 | 06 | 0040 | BETA | Aug 4, 1999 | Aug 11, 1999 | Aug 24, 1999 |
| № 8649 | S15 | W65 | 02 | 0010 | ALPHA | Jul 30, 1999 | Aug 6, 1999 | Aug 19, 1999 |
| № 8647 | S18 | W48 | 17 | 0140 | BETA | Jul 31, 1999 | Aug 7, 1999 | Aug 21, 1999 |
| № 8645 | S25 | W43 | 27 | 0490 | BETA-GAMMA | Aug 1, 1999 | Aug 8, 1999 | Aug 22, 1999 |
| № 8640 | N17 | W93 | 01 | 0010 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
