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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8795 | S12 | E03 | 04 | 0070 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 2, 2000 |
| № 8794 | S14 | E41 | 01 | 0030 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S16 | W07 | 01 | 0020 | ALPHA | Dec 12, 1999 | Dec 19, 1999 | Jan 1, 2000 |
| № 8792 | N17 | E40 | 03 | 0060 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8791 | S15 | E19 | 01 | 0000 | ALPHA | Dec 14, 1999 | Dec 20, 1999 | Jan 3, 2000 |
| № 8790 | N12 | W10 | 14 | 0090 | BETA | Dec 11, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N11 | W26 | 12 | 0460 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N13 | W66 | 03 | 0010 | BETA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N15 | W51 | 01 | 0100 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
