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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8667 | N23 | E71 | 03 | 0030 | BETA | Aug 19, 1999 | Aug 26, 1999 | Sep 9, 1999 |
| № 8666 | N14 | W57 | 03 | 0020 | BETA | Aug 10, 1999 | Aug 16, 1999 | Aug 30, 1999 |
| № 8665 | S25 | E53 | 06 | 0030 | BETA | Aug 18, 1999 | Aug 25, 1999 | Sep 8, 1999 |
| № 8662 | S16 | W17 | 37 | 0180 | BETA | Aug 13, 1999 | Aug 19, 1999 | Sep 2, 1999 |
| № 8657 | S28 | W54 | 01 | 0060 | ALPHA | Aug 10, 1999 | Aug 17, 1999 | Aug 31, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to August 1999. The gray background is the average SSN index.
