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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 2, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8785 | N14 | E68 | 01 | 0060 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8784 | N30 | E15 | 04 | 0030 | BETA | Dec 4, 1999 | Dec 12, 1999 | Dec 26, 1999 |
| № 8783 | S16 | W61 | 03 | 0030 | BETA | Nov 29, 1999 | Dec 5, 1999 | Dec 19, 1999 |
| № 8782 | N09 | W56 | 17 | 0220 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8781 | S12 | W19 | 16 | 0250 | BETA | Dec 2, 1999 | Dec 9, 1999 | Dec 22, 1999 |
| № 8780 | S15 | W42 | 01 | 0000 | ALPHA | Nov 30, 1999 | Dec 7, 1999 | Dec 21, 1999 |
| № 8778 | S15 | W81 | 07 | 0160 | 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.
