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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8806 | N18 | E73 | 04 | 0320 | BETA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8805 | N18 | W25 | 02 | 0010 | ALPHA | Dec 17, 1999 | Dec 24, 1999 | Jan 7, 2000 |
| № 8804 | S17 | E68 | 01 | 0150 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | E12 | 12 | 0070 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8800 | N10 | E20 | 01 | 0000 | ALPHA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S13 | E23 | 48 | 0550 | BETA-GAMMA-DELTA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S33 | W39 | 10 | 0060 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8796 | S25 | W56 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 21, 1999 | Jan 4, 2000 |
| № 8794 | S14 | W38 | 10 | 0020 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 5, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
