Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8795 | S12 | W08 | 10 | 0060 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 2, 2000 |
| № 8794 | S15 | E31 | 02 | 0030 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S16 | W17 | 05 | 0010 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 1, 2000 |
| № 8792 | N16 | E30 | 04 | 0080 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8790 | N13 | W20 | 16 | 0040 | BETA | Dec 11, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N12 | W37 | 14 | 0440 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N17 | W72 | 02 | 0000 | BETA | Dec 8, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N16 | W62 | 01 | 0090 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1970, January to 1999, December. Gray background - average solar cycle.
