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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8790 | N09 | E47 | 04 | 0020 | BETA | Dec 12, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N09 | E29 | 17 | 0550 | BETA-GAMMA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N11 | W08 | 03 | 0020 | BETA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N13 | E05 | 04 | 0130 | BETA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8781 | S12 | W88 | 02 | 0050 | BETA | Dec 1, 1999 | Dec 8, 1999 | Dec 22, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
