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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8789 | N29 | W26 | 03 | 0010 | BETA | Dec 3, 1999 | Dec 10, 1999 | Dec 24, 1999 |
| № 8788 | N10 | E63 | 01 | 0270 | ALPHA | Dec 10, 1999 | Dec 17, 1999 | Dec 30, 1999 |
| № 8787 | N11 | E27 | 01 | 0000 | ALPHA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8786 | N22 | W26 | 02 | 0000 | BETA | Dec 3, 1999 | Dec 10, 1999 | Dec 24, 1999 |
| № 8785 | N13 | E40 | 02 | 0100 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8782 | N10 | W86 | 15 | 0310 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8781 | S12 | W45 | 13 | 0190 | BETA | Dec 2, 1999 | Dec 9, 1999 | Dec 22, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
