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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8801 | S22 | W16 | 04 | 0010 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8800 | N09 | E44 | 01 | 0000 | ALPHA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8799 | S09 | E44 | 07 | 0050 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S14 | E45 | 14 | 0280 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S33 | W19 | 10 | 0090 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8796 | S26 | W35 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 4, 2000 |
| № 8794 | S14 | W23 | 06 | 0020 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S16 | W73 | 01 | 0000 | ALPHA | Dec 12, 1999 | Dec 19, 1999 | Jan 1, 2000 |
| № 8792 | N20 | W27 | 03 | 0010 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8788 | N14 | W89 | 01 | 0080 | ALPHA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
