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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 10, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8664 | N23 | E03 | 04 | 0010 | BETA | Aug 11, 1999 | Aug 18, 1999 | Sep 1, 1999 |
| № 8662 | S16 | E22 | 27 | 0230 | BETA | Aug 13, 1999 | Aug 19, 1999 | Sep 2, 1999 |
| № 8661 | S15 | W53 | 01 | 0010 | ALPHA | Aug 7, 1999 | Aug 14, 1999 | Aug 27, 1999 |
| № 8657 | S30 | W21 | 05 | 0100 | BETA | Aug 9, 1999 | Aug 16, 1999 | Aug 31, 1999 |
| № 8656 | N16 | W71 | 05 | 0020 | BETA | Aug 6, 1999 | Aug 12, 1999 | Aug 26, 1999 |
| № 8651 | N26 | W90 | 05 | 0180 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N18 | W92 | 01 | 0000 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 24, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
