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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8659 | S23 | E24 | 01 | 0010 | ALPHA | Aug 7, 1999 | Aug 14, 1999 | Aug 27, 1999 |
| № 8658 | S25 | W11 | 02 | 0010 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8657 | S31 | E58 | 01 | 0060 | ALPHA | Aug 9, 1999 | Aug 17, 1999 | Aug 31, 1999 |
| № 8656 | N19 | E08 | 10 | 0060 | BETA | Aug 5, 1999 | Aug 12, 1999 | Aug 26, 1999 |
| № 8651 | N26 | W16 | 49 | 1080 | BETA-GAMMA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N18 | W16 | 05 | 0040 | BETA | Aug 4, 1999 | Aug 10, 1999 | Aug 24, 1999 |
| № 8649 | S16 | W78 | 01 | 0010 | ALPHA | Jul 30, 1999 | Aug 6, 1999 | Aug 19, 1999 |
| № 8647 | S18 | W61 | 22 | 0270 | BETA | Jul 31, 1999 | Aug 7, 1999 | Aug 21, 1999 |
| № 8645 | S25 | W53 | 36 | 0570 | BETA-GAMMA | 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.
