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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 6, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8661 | S14 | E01 | 02 | 0000 | BETA | Aug 7, 1999 | Aug 14, 1999 | Aug 28, 1999 |
| № 8660 | S34 | W38 | 04 | 0010 | BETA | Aug 4, 1999 | Aug 11, 1999 | Aug 26, 1999 |
| № 8657 | S30 | E28 | 11 | 0090 | BETA | Aug 9, 1999 | Aug 16, 1999 | Aug 30, 1999 |
| № 8656 | N19 | W20 | 19 | 0080 | BETA | Aug 5, 1999 | Aug 12, 1999 | Aug 26, 1999 |
| № 8655 | N23 | W11 | 05 | 0010 | BETA | Aug 6, 1999 | Aug 13, 1999 | Aug 27, 1999 |
| № 8651 | N26 | W44 | 39 | 0780 | BETA-GAMMA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N17 | W43 | 01 | 0040 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 24, 1999 |
| № 8647 | S19 | W87 | 07 | 0120 | BETA | Jul 31, 1999 | Aug 7, 1999 | Aug 21, 1999 |
| № 8645 | S28 | W78 | 09 | 0230 | BETA | 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.
