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) | |
|---|---|---|---|---|---|---|---|---|
| № 8789 | N29 | W48 | 03 | 0000 | BETA | Dec 3, 1999 | Dec 10, 1999 | Dec 24, 1999 |
| № 8788 | N10 | E43 | 13 | 0510 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N12 | E03 | 02 | 0000 | BETA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N13 | E18 | 06 | 0130 | BETA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8781 | S13 | W71 | 04 | 0140 | BETA | Dec 2, 1999 | Dec 8, 1999 | Dec 22, 1999 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1970, January to 1999, December. Gray background - average solar cycle.
