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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 19, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8807 | N11 | E70 | 04 | 0030 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N19 | E64 | 13 | 0630 | BETA-GAMMA | Dec 25, 1999 | Jan 1, 2000 | Jan 14, 2000 |
| № 8805 | N18 | W39 | 01 | 0000 | ALPHA | Dec 17, 1999 | Dec 24, 1999 | Jan 6, 2000 |
| № 8804 | S19 | E56 | 03 | 0210 | BETA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | W00 | 19 | 0100 | BETA-GAMMA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8800 | N10 | E06 | 01 | 0000 | ALPHA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S13 | E09 | 55 | 0490 | BETA-GAMMA-DELTA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S32 | W55 | 02 | 0010 | ALPHA | Dec 15, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8794 | S16 | W51 | 02 | 0000 | ALPHA | 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.
