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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8795 | S13 | W19 | 04 | 0040 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 2, 2000 |
| № 8794 | S14 | E21 | 02 | 0030 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S17 | W31 | 01 | 0000 | ALPHA | Dec 11, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8792 | N17 | E18 | 04 | 0030 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8790 | N12 | W33 | 07 | 0010 | BETA | Dec 11, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N10 | W49 | 07 | 0380 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8785 | N14 | W71 | 02 | 0080 | BETA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
