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) | |
|---|---|---|---|---|---|---|---|---|
| № 8791 | S13 | E68 | 01 | 0010 | ALPHA | Dec 14, 1999 | Dec 21, 1999 | Jan 4, 2000 |
| № 8790 | N10 | E35 | 04 | 0020 | BETA | Dec 12, 1999 | Dec 18, 1999 | Jan 1, 2000 |
| № 8788 | N10 | E16 | 14 | 0570 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
| № 8787 | N10 | W20 | 05 | 0010 | BETA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8785 | N14 | W08 | 02 | 0150 | 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.
