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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 30, 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 | N11 | E75 | 02 | 0100 | ALPHA | Jan 6, 2000 | Jan 12, 2000 | Jan 26, 2000 |
| № 8813 | S15 | E66 | 05 | 0040 | BETA | Jan 5, 2000 | Jan 12, 2000 | Jan 25, 2000 |
| № 8812 | S28 | W19 | 03 | 0010 | BETA | Dec 29, 1999 | Jan 5, 2000 | Jan 19, 2000 |
| № 8811 | S30 | W61 | 02 | 0010 | BETA | Dec 26, 1999 | Jan 2, 2000 | Jan 16, 2000 |
| № 8810 | N37 | E21 | 17 | 0350 | BETA | Jan 2, 2000 | Jan 9, 2000 | Jan 23, 2000 |
| № 8809 | N22 | E04 | 06 | 0030 | BETA | Dec 31, 1999 | Jan 7, 2000 | Jan 21, 2000 |
| № 8806 | N18 | W81 | 07 | 0390 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 14, 2000 |
| № 8804 | S18 | W89 | 01 | 0100 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | 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.
