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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 10, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8794 | S15 | E60 | 01 | 0050 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S16 | E13 | 08 | 0010 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 1, 2000 |
| № 8792 | N16 | E58 | 01 | 0080 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8791 | S14 | E38 | 02 | 0010 | BETA | Dec 14, 1999 | Dec 21, 1999 | Jan 3, 2000 |
| № 8790 | N11 | E09 | 10 | 0050 | BETA | Dec 12, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N10 | W08 | 13 | 0560 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N13 | W46 | 01 | 0010 | ALPHA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N14 | W33 | 02 | 0110 | BETA | 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.
