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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 25, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8810 | N35 | E77 | 01 | 0030 | ALPHA | Jan 1, 2000 | Jan 8, 2000 | Jan 23, 2000 |
| № 8809 | N21 | E69 | 03 | 0010 | BETA | Dec 31, 1999 | Jan 7, 2000 | Jan 21, 2000 |
| № 8807 | N12 | W09 | 10 | 0020 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N20 | W12 | 48 | 1050 | BETA-DELTA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8804 | S18 | W23 | 02 | 0300 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | W78 | 03 | 0000 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8798 | S13 | W71 | 12 | 0280 | BETA-GAMMA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
