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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8810 | N38 | E41 | 11 | 0410 | BETA | Jan 2, 2000 | Jan 9, 2000 | Jan 24, 2000 |
| № 8809 | N22 | E24 | 07 | 0040 | BETA | Dec 31, 1999 | Jan 7, 2000 | Jan 21, 2000 |
| № 8806 | N20 | W57 | 48 | 0810 | BETA-GAMMA-DELTA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8804 | S18 | W67 | 03 | 0190 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
