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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 20, 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 | S19 | E03 | 02 | 0000 | BETA | Dec 21, 1999 | Dec 28, 1999 | Jan 11, 2000 |
| № 8807 | N11 | E54 | 04 | 0040 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N19 | E47 | 20 | 0890 | BETA-GAMMA | Dec 25, 1999 | Jan 1, 2000 | Jan 14, 2000 |
| № 8804 | S19 | E40 | 03 | 0250 | BETA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | W19 | 13 | 0070 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8798 | S13 | W09 | 41 | 0500 | BETA-GAMMA-DELTA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S32 | W68 | 01 | 0000 | ALPHA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
