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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8814 | N10 | E62 | 02 | 0110 | ALPHA | Jan 6, 2000 | Jan 12, 2000 | Jan 26, 2000 |
| № 8813 | S17 | E52 | 04 | 0040 | BETA | Jan 5, 2000 | Jan 12, 2000 | Jan 25, 2000 |
| № 8812 | S28 | W33 | 01 | 0000 | ALPHA | Dec 29, 1999 | Jan 5, 2000 | Jan 19, 2000 |
| № 8810 | N37 | E08 | 16 | 0320 | BETA | Jan 1, 2000 | Jan 9, 2000 | Jan 23, 2000 |
| № 8809 | N24 | W06 | 03 | 0000 | BETA | Dec 31, 1999 | Jan 7, 2000 | Jan 21, 2000 |
| № 8806 | N22 | W94 | 02 | 0060 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 14, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
