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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 24, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8808 | S18 | W47 | 01 | 0010 | ALPHA | Dec 21, 1999 | Dec 28, 1999 | Jan 11, 2000 |
| № 8807 | N11 | E02 | 05 | 0020 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N19 | W01 | 28 | 1100 | BETA-GAMMA-DELTA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8804 | S18 | W11 | 01 | 0250 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S14 | W69 | 04 | 0030 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8798 | S14 | W59 | 13 | 0370 | BETA-GAMMA | Dec 21, 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.
