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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8784 | N30 | E32 | 04 | 0020 | BETA | Dec 5, 1999 | Dec 12, 1999 | Dec 26, 1999 |
| № 8783 | S16 | W43 | 05 | 0020 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8782 | N11 | W41 | 23 | 0170 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8781 | S12 | W03 | 21 | 0230 | BETA | Dec 2, 1999 | Dec 9, 1999 | Dec 22, 1999 |
| № 8780 | S16 | W26 | 01 | 0000 | ALPHA | Nov 30, 1999 | Dec 7, 1999 | Dec 21, 1999 |
| № 8778 | S14 | W62 | 13 | 0130 | BETA | Nov 27, 1999 | Dec 4, 1999 | Dec 18, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
